Showing posts with label economic products. Show all posts
Showing posts with label economic products. Show all posts

Thursday, April 3, 2014

Rubber and Rubber Based Products

Sri Lanka pioneered Asian Rubber industry in 1876 with planting of rubber trees in Henerathgoda Botanical Gardens- Colombo. At present the country ranks among the world's top ten largest producers and 7th largest exporter in natural rubber. Sri Lanka Rubber Industry consists of two closely independent sectors; the rubber plantation industry which producers raw rubber and high value new product innovations in finished rubber goods. Presently, Sri Lanka produces about 153,000 metric tons of natural rubber annually.


Sri Lanka pride itself in manufacturing a number of value added rubber products by processing raw rubber. These range from Rubber Products made in Sri Lanka are internationally acclaimed and accepted for quality and durability. Sri Lanka's industrial solid tyres are not only recognized as the best product in the world but also industry prides itself as the market leader of the global market.
   

Glove manufacturing & exporting industry of Sri Lanka, is placed as one of the top manufactures of the world also contribute more than 5 % of global demand.  extrusion products like rubber bands, beadings, latex products such as medical, surgical and household gloves, and industrial products like hoses, auto parts, industrial components, tyres, tubes, automotive and aviation tyres and general rubber products like floor mats, carpets, sports goods, footwear, hot water bottles and related components. The country now has a premium quality natural rubber type known as Lanakprene which is an odour free to a certain extend light coloured, clean, rubber which is ideally suited for medical equipment and up market, value added products .Against stiff competition the rubber industry caters to a significant market share and has established a reputation for quality and reliability. In 2011 rubber finished products industry earned an export income of US$ 884 Mn, a 59 % growth over the previous year.

The Rubber Industry provides employment to a vast number of people mainly in rural estates. Together the activities of tapping, manufacturing, industries of semi finished, semi processed rubber products. Value added products and those involved in trading provide employment to over 300,000 persons.

Major markets for Manufactured Rubber products are USA, Germany, Italy, Belgium, & UK. Semi processed rubber destinations are dominated by Malaysia, India, Pakistan, Germany and USA. 

  Related Institutions/ Associations

  •     Sri Lanka Association of Manufactures & Exporters of Rubber Products ( SLAMERP)
  •     Sri Lanka Society of Rubber Industry (SRI)
  •     Association of Small and Medium Rubber Product Manufactures
  •     The Colombo Rubber Traders' Association (CRTA)
  •     Planters' Association
  •     Rubber Research Institute
  •     Rubber Development Department
  •     Industrial Technology Institute
  •     Industrial Development Board
  •     Sri Lanka Export Development Board

Coconut & Coconut Based Products

Introduction
Coconut is one of the major plantation crops in Sri Lanka which accounts for approximately 12% of all agricultural produce in Sri Lanka. Total land area under cultivation is 395,000 hectares and about 2,500 million nuts are producing per year.
  

Sri Lanka is very popular in world market for Desiccated Coconut (DC) and Brown fiber. Distinguish white colour and characteristic taste of the DC ranked Sri Lanka at No. 04 position of world export of all kernel products. Sri Lanka is in No. 01 position of world exports of Brown fiber. The technique called drum system used to extract fiber resulting long pure fiber which are more suitable for brush industry.
Coconut Development Authority, Coconut Cultivation Board and Coconut Research Institute are three major Government Institutions that are responsible for product & quality improvement, supply development and research respectively.

To ensure the quality of DC exports, the certificate issued by the Coconut Development Authority should accompanied with each and every shipment.



Product Range

  • Desiccated Coconut


Desiccated coconut, made out of coconut kernel, is used in the confectionery industry. There are 60 mills in Sri Lanka and the approximate total production per annum is 75,000 metric tons.

All mills have  quality control laboratories and closely monitored by the Government Authorities.

Product Description
- Colour - Natural White
- Moisture - Maximum 3% on dry basis
- Fat Content - Minimum 65% on dry basis

Major Markets
USA, European Union, Turkey, Egypt and UAE

  • Coconut Cream and Milk

100% pure concentrate of coconut kernel without artificial flavours or preservatives is used in preparation of curries and desserts.
Available in canned and packet form.

Major Markets
UK, Middle East, Netherlands, Australia, France and Germany.

  • Coconut Water
This is used as a natural energy and health drink. It contain Glucose as a main ingredient and Minerals ( Potassium, Calcium, Magnesium, Prosperous) as trace elements.

Fiber Products

  • Coir Twine


Made out of bristle fiber (long fiber) or bristle fiber mixed with omatt fiber (short fiber) according to buyer specifications. Major uses are in agriculture, horticulture and aquaculture.

Major Markets
USA, UK, France, South Korea and Japan.

  • Door Mats (Hand made/Machine made)
Door mats are made out of coir twine or yarn or coir fibre mixed with jute yarn.

Major Markets
European Union and Bulgaria.

  • Door Mats (Coir with steel springs)
Door mats are made out of coir fibre using steel springs, especially suitable for winter.
 

  • Geotextiles
Coconut fiber geotextiles, used for soil stabilization, landscaping and erosion control as environmental-friendly material.

Major Markets
South Korea, Japan, Netherlands, USA and Germany.

 

  • Rubberized Coir Products for Horticultural and Agricultural Industry
Inner layers of flower pots, basket liners, support poles for creepers and rubberized coir geotextiles are manufactured by spraying coir fiber with compounded latex.

Rubberized pots are used in nurseries as nursery pots. 

Major Markets
Korea, Japan, Netherlands and Germany.

 

  • Rubberized Coir Mattresses
Mixture of coir fiber and latex are steam heated, pressed and vulcanized to produce mattresses. These mattresses are used in physiological therapy for various kinds of bone diseases. 

Major Markets
Germany and Japan.

  • Coco Peat Products
In the process of extracting fiber from the coconut husk, the residue, which consists mainly of a powdery mixture, is known as coco peat and is used as a substitute for peat moss in Europe.

Exported in briquettes, blocks, disks or grow bags.

Major Markets
Germany, Netherlands and UK.


Coconut Shell Products

  • Charcoal Briquettes
This product, made out of coconut shell, is especially processed for outdoor and indoor barbeques as well as for domestic heating.

Major Markets
Middle East

Activated Carbon
The raw material used for the manufacture of activated carbon is coconut shell charcoal. Coconut shell charcoal, unlike wood and coal, is not chemically activated and is therefore ideally suited for use in food processing and the manufacture of medicines. These can be used in various industries for purification.

Major Markets
USA, South Africa, UK, Japan and Canada.

Friday, March 14, 2014

Ceylon Tea in Sri Lanka

Teas from the highest region on the island are described as the 'champagne' of Ceylon teas.
Until the 1860’s THE MAIN CROP PRODUCED on the island of Sri Lanka, then Ceylon, was coffee. But in 1869, the coffee-rust fungus, Hemileia vastatrix, killed the majority of of the coffee plants and estate owners had to diversify into other crops in order to avoid total ruin.

The owners of Loolecondera Estate had been interested in tea since the late 1850’s and in 1866, James Taylor, a recently arrived Scot, was selected to be in charge of the first sowing of tea seeds in 1867, on 19 acres of land.Taylor had acquired some basic knowledge of tea cultivation in North India and made some initial experiments in manufacture, using his bungalow verandah as the factory and rolling the leaf by hand on tables. Firing of the oxidized leaf was carried out on clay stoves over charcoal fires with the leaf on wire trays. His first teas were sold locally and were declared delicious. By 1872, Taylor had a fully equipped factory, and, in 1873, his first quality teas were sold for a very good price at the London auction. Through his dedication and determination, Taylor was largely responsible for the early success of the tea crop in Ceylon. Between 1873 and 1880, production rose from just 23 pounds to 81.3 tons, and by 1890, to 22,899.8 tons.

Most of the Ceylon tea gardens are situated at elevations between 3,000 and 8,000 feet in two areas of the southwestern part of the island, to the east of Colombo and in the Galle district on the southern point. In the hot, steamy plains and foothills, the tea bushes flush every seven or eight days and are picked all year round. The finest teas are gathered from late June to the end of August in eastern districts and from the beginning of February to mid-March in the western parts.
Until 1971, more than 80 percent of the island’s tea estates were owned and managed by British companies.

In 1971, the Sri Lankan government introduced a Land Reform Act which gave the state control of the majority of the plantations (which also grow rubber and coconuts for export) leaving about one-third in private hands. Since 1990, a restructuring program has been going on to involve the private sector companies (both Sri Lankan and foreign) as Managing Agents of the state-owned plantations. The long-term aim is for the private managing companies to take on most, if not all, of the financial responsibility and control of the estates, with the government retaining ownership.



Ceylon Tea Highlights


Tea pickers gathering leaves into their baskets

Extreme political, industrial, and economic problems over the past years have meant that Sri Lanka has fallen from the position of number one producer in the world to number eight in 1993. Producers are having to face major decisions regarding production methods, product range, and export markets. Although the U.K was once Sri Lanka?s biggest customer, almost 70 percent of production now goes to Russia, the Middle East, and North Africa.

The Arab market used to prefer orthodox teas but consumers there are steadily moving towards European tastes and are demanding more tea in tea bags. Sri Lanka?s fine orthodox teas, considered by many to be among the best teas in the world, are not suitable for tea bags.

Only 3 percent of production in 1993 was CTC and producers are having to decide whether to convert to CTC production in order to reach a wider market. Some manufacturers think that there will always be a market for the orthodox teas; others think that CTC is the best way forward.

New customers are also being sought for the increasing range of packeted teas?in sachets, cartons, economy packs, reed ware, basket packs, soft wood boxes, tins, and canisters?that are now available. Products containing 100 percent Ceylon tea are now using the Lion logo, developed by the Ceylon Tea Board, that guarantees the country of origin and protects the image of Sri Lanka?s quality teas.


Produced mainly from bushes that grow above 4,000 feet

Sri Lanka?s finest teas are produced mainly from bushes that grow above 4,000 feet. The bushes grow more slowly in the cooler, mistier Climate, and are harder to harvest because of the steep angle of the slopes on which they are planted.

There are six main tea-producing areas. Galle, to the south of the island; Ratnapura, about 55 miles east of the capital Colombo; Kandy, the low region near the ancient royal capital; Nuwara Eliya, the highest area that produces the finest teas; Dimbula, west of the central mountains; and Uva, located east of Dimbula.

The teas produced in each region have their own individual characteristics of flavor, aroma, and color. Low-grown teas, produced at 1,500 to 1,800 feet, are of good quality and give good color and strength but lack the distinctive flavor and bright fresh taste of the higher-grown teas and are usually used in blending. Mid-grown teas, grown between 1,800 and 3,500 feet, are rich in flavor and give good color.

High-grown teas, from heights of between 3,500 and 7,500 feet, are the very best that Sti Lanka produces, giving a beautiful golden liquor and an intense powerful flavor As well as the wonderful black teas, some estates also produce silver tip white tea that gives a very pale straw-colored liquor and should be drunk without milk All Sri Lanka?s black teas are best drunk with a little milk.


History of Ceylon Tea

In the 1840 a Scotsman by the name of James Taylor read about the Jewel of an Island called Ceylon and the opportunities existing there for growing coffee. A few months later he moved to the Hill Country area and planted not only coffee but also some tea seeds from India.

The "ugly little shrub" was grown next to his acres of coffee and provided large yields. It wasn't till a couple of seasons later that a virulent leaf disease devastated his whole plantation but the "ugly little shrub" was immune and the Tea Industry came into being. Soon the perilously steep mountainside of the hill country were carpeted with the vibrant green of tea bushes. And Ceylon Tea became the worlds favorite beverage.


The origins of Tea was with the Chinese Emperor Shen Nung who was boiling water when the leaves from a nearby plant Camellia sinensis plant floated into the pot. The emperor drank the mixture and declared it gave one "vigor of body, contentment of mind, and determination of purpose." Perhaps as testament to the emperor's assessment, tea the potion he unwittingly brewed that day today is second only to water in worldwide consumption.

The U.S. population is drinking its fair share of the brew; in 1994, Americans drank 2.25 billion gallons of tea in one form or another hot, iced, spiced, flavored, with or without sugar, honey, milk, cream, or lemon.


Cultivation

The Tea plant, Camellia Sansis, is cultivated variety of the tree originating from the region between India and China. The tea leaves are mostly hand plucked. When the plant is plucked two leaves and a bud are cut. An experienced plucker can pluck up to 30 kg tea leaves per day. To make one kg black tea, approximately 4 kg tea leaves are needed. One tea plant produces about 70 kg black tea a year.

In a warm Climate the plant is plucked for the first time after 4 years and will produce tea for at least 50 years. A suitable climate for cultivation has a minimum annual rainfall of 45 to 50 inches (l, 140 to 1,270 millimeters). Tea soils must be acid; tea cannot be grown in alkaline soils. A desirable pH value is 5.8 to 5.4 or less.


Scented and spiced teas are made from black tea. "Scented teas look just like any other tea," says FDA chemist and tea expert Robert Dick, " because the scent is more or less sprayed on. They're flavored with just about anything peach, vanilla, cherry. The spiced teas, on the other hand, usually contain pieces of spices cinnamon or nutmeg or orange or lemon peel so you can see there's something in there."


Black Tea Blends


Like coffee plants, tea likes hot days, cool nights and plenty of rain, and also like coffee, most high quality tea is grown in mountainous regions. During the growing season, tea is harvested every seven days. Only the two tender uppermost leaves and terminal buds are plucked by hand. After this gentle beginning, the leaves are left in a hot room to wither, then put into a machine that rolls the leaves and releases their juices.

These juices react with the air (oxidation) giving black teas the color and flavor we love. The tea is then dried in ovens (fired) and graded according to size. (this grading process is what is responsible for all of those confusing letters: OP (Orange Pekoe), BP (Broken Pekoe), and even FTGFOP (Fancy Tippy Golden Flowery Pekoe). Generally the more initials the better the Tea.


Herbal Teas

Not tea at all. Dried flowers, roots and bark have been brewed into a consumable hot liquid for many centuries as folk medicines throughout the Orient and Europe.

The European tradition is to use only one main herb, such as Chamomile. Americans, on the other hand, traditionally concoct potions containing many different herbs and flowers such as Rosehips and Hibiscus.




How Tea is manufactured

Everyday around 300,000 estate workers pluck several million tea leaves by hand. This is the first step in the manufacture of quality Ceylon tea.

Only the bud and the two youngest leaves are plucked, for it is only these leaves that have the flavour and aroma. In other parts of the world plucking is done by machines. These machines pluck the bud, the young leaf, a lot of coarse leaf and few twigs as well. Coarse leaf and and twigs just add bulk and not flavour to the tea.

The plucked tea leaf is then brought to the muster sheds where they are wheighed in, and first quality inspection is made. The leaf is then moved to the factory where they are withered using large blowers.

The next step in the manufacturing process involves, cutting the leaves. This brings out the juices and begins the fermentation process. Fermentation is the critical step. The humidity, temperature and fermentation time has to be well controled or the flavour is lost.

After fermentation is completed, the leaf is fired, to lock in the flavour, to dry it and to improve the keeping qualities. Absoloutely no preservative or artificial flavouring are added in the manufacture of pure Ceylon tea.

The final step is the separation of the product according the color and the particle size. Here strignent quality control is done and anything that does not measure upto the standards is rejected.

The finished product is shipped in bulk to mainly to europe, the middle-east, Australia, and North America. Only the best tea is exported. Unfortunately once it leaves Sri Lanka it is mixed with lower quality and cheaper produce from the African countries and India.
 References :-
http://www.angelfire.com/wi/SriLanka/ceyl_tea.htm

Tuesday, March 11, 2014

Gems of in Sri Lanka

A gemstone is the naturally occurring crystalline form of a mineral which is desirable for its beauty, valuable in its rarity, and durable enough to be enjoyed for generations. There are more than 30 popular gem varieties and many more rare collector gemstones. Some varieties also come in a range of colors.

The Gem industry in Sri Lanka (also known as Ceylon, Serendib, etc..) has been in existence for over 2500 years. Some of the rarest of gem stones of exquisite beauty have taken pride of place, in the Crown jewels of Kings and Queens from time of Great Roamn Emperors.


Gems of Highlights

Sapphire is an aluminum oxide. Its colour varies from very light to dark blue to violetish-blue, bluish-green, yellow, slightly reddish-orange, brown, nearly opaque black, colourless, pink, violet and the pinkish-orange padparadscha (lotus flower).

Varieties
Coloured varieties, star sapphire, alexandrite-like sapphire.

Sources
Sri Lanka, Kashmir (India), Burma, Thailand, Australia, Tanzania, Kenya, Montana, Madagascar

Toughness
Excellent, except in laminated or fractured stones.

Precautions
Sapphires may fade if heated

Treatments
Sapphires can be x-rayed to intensify their colour. Natural sapphires undergo heat and diffusion treatments in Thailand. With the first method, sapphires with latent chemical components for good colour are "ripened" to a desirable colour through heating. In diffusion treatment, sapphires that lack the components for good colour are placed in a bath of colouring oxides that penetrate the outer layers of the stone. Treatment of blue stones is permanent.

History
According to an ancient Persian legend, the earth rested on a great sapphire whose reflection was seen in the sky. The stone also appears in the Promethean legend. Prometheus was chained to a rock by Zeus for having stolen fire from the gods. After being rescued by Hercules, a link of the chain remained on his finger, and attached to it was a piece of rock. Zeus agreed to grant Prometheus his freedom if he wore the link as a reminder of his sin. Later a ring set with a sapphire replaced the link and stone. Sapphire symbolizes truth, sincerity and constancy. It was believed to protect the wearer against capture by an enemy, and to win the favour of princesses. It also protected against poison. It was said that if a poisonous snake were put in a vessel with a sapphire, the rays from the gem would kill it. The name sapphire originally comes from Sanskrit. It became sappheiros in Greek, meaning blue. Before the value of sapphire was known to them, villages in the Zanzkar mountains of Kashmir (India) used the gem as a flint to start fires.

Cuts & Uses
Faceted and en cabochon, usually mixed cut, beads, carved (poor quality). Synthetic sapphire is used in watches, precision instruments and electronic equipment.


Ceylon Sapphires
The Ceylon Blue Sapphire is known for its beauty ? possessing the glorious
cornflower blue shade ? as well as for being one of the few sapphires in the world that can be sold as a completely natural stone without heat treatment. The blues aside, Ceylon sapphires also come in beautiful hues including pink, yellow, orange, green, purple, lavender and of course, the inimitable padparadscha sapphire ? named after the lotus flower. All these highly marketable qualities of Ceylon sapphire has created brand recognition world wide - a brand not created by the producers of the stone, but by the sellers and consumers.

Sapphires that show a star-like light effect are called star sapphires; the most famous star sapphire from
Sri Lanka is displayed in the Museum of Natural History in New York. Star sapphires or star rubies display a star-like marking and this effect, commonly known as asterism, occurs when light falls on the cut stone, cut in the cabochon form, and three rays appear giving a six-point star. However, stones with six rays have also been known to occur.

Lastly, there is milky corundum, a white opaque form of corundum also called geuda, which for many years was regarded as useless and discarded, often ending up lining fish tanks in some gemstone merchant's house. This happened until dealers in Thailand learned to heat-treat geudas to change the colour of the stone from an unattractive cloudy grey-white to a bright, sparkling blue. They completed the work nature began and ended up with a blue sapphire - of much greater value than a useless pebble. The colour of heat-treated blue sapphires are stable and the chemical composition of the stone is that of a sapphire, although prices are lower than for a similar quality stone with natural colour.


Choosing a Sapphire
The most famous sources for sapphire are Kashmir and Burma, (now known as Myanmar). Kashmir sapphire, which was discovered in 1881 when a landslide in the Himalayas uncovered beautiful blue pebbles, has a rich velvety colour prized by connoisseurs. Burma sapphires, from the same region that produces fabulous rubies, are also very fine. However, today, these two sources account for a very small quantity of the sapphire on the market.

Most fine sapphire on the market today comes from Sri Lanka, which produces a wide range of beautiful blues from delicate sky blue colours to rich saturated hues. Kanchanaburi in Thailand and Pailin in Cambodia are renowned for deep blue, even colours. Two relatively new mining localities are showing promise: Madagascar, which has produced some exceptionally fine stones in small sizes but has no organized mining yet, and Tanzania, which has long produced sapphire in other colours but is starting to produce blue colours as well from a new deposit in the south.

The most valuable sapphires have a medium intense, vivid blue colour. The best sapphires hold the brightness of their colour under all different types of lighting. Any black, grey, or green overtones mixed in with the blue will reduce a stone's value. In general, a more pastel blue would be less preferred than a vivid blue but would be priced higher than an overly dark blackish-blue colour. As with all gemstones, sapphires, which are "clean" and have few visible inclusions or tiny flaws are the most valuable.

Sapphires are most often cut in a cushion shape - a rounded rectangle - or an oval shape. You can also find smaller sapphires in round brilliant cuts or a wide variety of fancy shapes, including triangles, squares, emerald cuts, marquises, pear shapes, baguette shapes, cabochon cuts and smooth domes.


Ruby

Ruby is an aluminum oxide, a variety of corundum; it occurs in medium to dark tones of red and violetish-red to brownish-red

Varieties
Star ruby

Sources
Sri Lanka, Burma, Thailand, Africa (Kenya, Madagascar, Tanzania), India.

Toughness
Excellent, except in laminated or fractured stones.

Treatments
The Burmese believed that "blazing red" stones could be found in a "bottomless" valley. Natives threw pieces of meat into the valley, hoping that some stones could then be recovered by killing the vultures. In the Royal Collection of England, you can view a gold ring set with a pale but nearly flawless ruby into which a portrait of Louis XII of France is carved.

Cuts & Uses
Faceted or en cabochon, usually mixed cut (brilliant crown, step-cut pavilion), beads, carved (poor quality).


Choosing a Ruby

The most important factor in the value of a ruby is colour. The top qualities are as red as you can imagine: a saturated pure spectral hue without any overtones of brown or blue. The word red is derived from the Latin word for ruby, ruber, which is derived from similar words in Persian, Hebrew, and Sanskrit. The intensity of colour of a fine ruby is like a glowing coal, probably the most intensely coloured substance our ancestors ever saw. It is no wonder they ascribed magical powers to these fires that burned perpetually and never extinguished themselves.

Besides colour, other factors that influence the value of a ruby are clarity, cut, and size. Rubies that are perfectly transparent, with no tiny flaws, are more valuable than those with inclusions, which are visible to the eye. Cut can make a big difference in how attractive and lively a ruby appears to the eye. A well-cut stone should reflect backlight evenly across the surface without a dark or washed-out area in the centre that can result from a stone that is too deep or shallow. The shape should also be symmetrical and there should not be any nicks or scratches in the polish. Rubies and other gemstones are sold per carat, a unit of weight equal to one-fifth of a gram. Larger rubies, because they are more rare, will cost more per carat than smaller stones of the same quality.

The Ruby sometimes displays a three-ray, six-point star. These star rubies are cut in a smooth domed cabochon cut to display the effect. The star is most visible when illuminated with a single light source: it moves across the stone as the light moves. This effect, called asterism, is caused by light reflecting off tiny rutile needles, called "silk," which are oriented along the crystal faces.

The value of star rubies and sapphires are influenced by two factors: the intensity and attractiveness of the body colour and the strength and sharpness of the star. All six legs should be straight and equally prominent. Star rubies rarely have the combination of a fine translucent or transparent colour and a sharp prominent star. These gems are valuable and expensive.

The most famous source of fine rubies is Burma, which is now called Myanmar. The ruby mines of Myanmar date back to centuries ago: stone age and bronze age mining tools have been found in the mining area of Mogok. Rubies from the le
gendary mines in Mogok often have a pure red colour, sometimes described as "pigeon's-blood", although that term is more fanciful than an actual practical standard in the trade today. Myanmar also produces intense pinkish red rubies, which are vivid and extremely beautiful. Many of the rubies from Burma have a strong fluorescence when exposed to ultraviolet rays like those in sunlight, which layers on extra colour. Burma rubies have a reputation of holding their vivid colour under all lighting conditions.

Sri Lankan stones are often pinkish in hue and many are pastel in tone. Some, however, resemble the vivid pinkish red hues from Burma. Rubies from Kenya and Tanzania surprised the world when they were discovered in the sixties because their colour rivals the world's best. Unfortunately, most of the ruby production from these countries has many inclusions, tiny flaws that diminish transparency. Rubies from the African mines are rarely transparent enough to facet. However, their fantastic colour is displayed to full advantage when cut in the cabochon style. A few rare clean stones of top quality have been seen.

Occasionally a few fine, top-quality rubies appear on the market from Afghanistan, Pakistan or the Pamir Mountains of the Commonwealth of Independent States. The terrain in these areas has made exploration for gemstones very difficult but someday they may produce significant quantities for the world market.


Alexandrite


Alexandrite is a variety of chrysoberyl, which ideally shows a distinct colour change from green in fluorescent light or daylight to red in incandescent light.

Varieties
A very small amount of alexandrite shows a cat's eye effect (chatoyancy).

Sources
Sri Lanka, Tanzania, Soviet Russia, Brazil, Zimbabwe - Rhodesia, Burma.

Toughness
Excellent

History
Alexandrite received its name because it was discovered on the birthday of
Czar Alexander II of Russia in 1830. Red and green are also the colours of the Russian Imperial Guard.

Cuts & Uses
Alexandrite is usually faceted. Chrysoberyl cat's eyes must be cut en cabochon to display a chatoyant effect.


Star stones

Star stones of the corundum family are either star sapphires or rubies. When light falls on these stones, a star effect is visible (known as asterism).

Sri Lanka is the best known source for star sapphires and star rubies. Star sapphires range in colour from grey to bluish-grey and from medium blue to medium dark blue. The very slightly purplish medium dark blue is the best colour grade for star sapphires. Star rubies range from light pink-red to purple-red through deep purple-red. The intense red star rubies are extremely rare. A good quality star stone should have a high degree of transparency and a well defined star with no weak or missing rays. It should be reasonably clean and in the face-up position, no distracting inclusions or cracks should be seen. There should be no excess weight at the bottom of the stone.

Star sapphires and rubies are hard stones (9 on the Moh?s scale), which can take a high degree of polish and retain the shinefor a long time. The special optical phenomenon of a well-defined six-ray star is a fascinating sight. The wearable qualities of the star stones make them suitable for men's rings.


Chrysoberyl

The species name chrysoberyl is given to a transparent, faceted gemstone that does not show a colour change between daylight and artificial light (the
chrysoberyl which shows a colour change is called alexandrite). The ideal colours of chrysoberyl are green and yellowish-green. In addition, due to strong dichroism, one may see an
attractive bi-coloured chrysoberyl occasionally. Hardness is 8.5 on the Moh's scale. The high refractive index of the stone makes it very lively when properly cut and polished




Cat's eye


A cat's eye like effect, known as 'chatoyancy', appears to move on this stone's surface. Cat's eye is a gem variety of chrysoberyl.


Hardness: 8.5 on the Mohs' scale.

There are generally two varieties of cat?s eye ? the alexandrite cat?s-eye and the chrysoberyl cat?s-eye, which is very popular in the Far East, particularly in Japan. The ideal colours of the chrysoberyl cat?s-eye are yellowish-brown, which is called the honey colour, and the yellow-green, which is called the apple green colour. A very good cat?s eye, apart from being of ideal colour, should have a high degree of transparency and a well-defined unbroken ray. It should be free from any distracting inclusions visible to the unaided eye. The chrysoberyl cat?s-eye is one of the most beautiful gemstones because of the ?chatoyancy? or the eye effect.

Description
A translucent variety of chrysoberyl (beryllium aluminum oxide) which exhibits a silvery white line across the stone. This moves as the stone, the light source or the observer moves and may appear to open and close like an eye. The finest quality has a sharp eye that appears to open and close as the stone is rotated, and exhibits a strong "milk and honey" effect (stone on one side of the eye appears lighter than the other). These colours switch as the stone or light source is moved. The most highly prized body colours are greenish-yellow and brownish-yellow (honey colour).

Varieties
Rare specimens also exhibit change of colour.

Sources Sri Lanka, Brazil.

Phenomena
Chatoyancy caused by the reflection of light off minute, parallel, needle-like rutile crystals or hollow tubes.

Toughness
Excellent

Miscellaneous
When a gem specimen exhibits both chatoyancy and change of colour, one or both phenomena will suffer. It is more common to find a good eye with poor change of colour. The conditions necessary for one phenomenon conflict with those needed for the other. The term cat's eye when used alone refers to chrysoberyl. Other minerals exhibiting chatoyancy must be qualified, e.g. tourmaline cat's eye.

History
Cat's eye has been regarded as a preserver of good fortune. The natives of Sri Lanka still consider it a charm against evil spirits. British royalty often use it as an engagement stone.

Cuts & Uses
Must be cut in a cabochon to produce cat's eye effect. This should be cut so that the long portion of the cabochon is 90 degrees to the direction of the needles.


Quartz

 


Quartz is the most common mineral on the face of the Earth. Gem varieties include amethyst (purple), citrine (yellow), milky quartz (cloudy, white variety), rock crystal (clear variety), rose quartz (pink to reddish-pink variety), and smokey quartz (brown to grey variety).

Gem varieties of quartz include: citrine, amethyst, rock crystal, rose quartz, and smokey quartz. There are also varieties of Quartz cat's eye.

Colours: citrine (yellow); amethyst (purple); rock crystal (colourless); rose quartz (pink); and smokey quartz (purplish-brown).



Amethyst



Description
A variety of quartz, silicon dioxide, which appears to be dark purple in transparent light.

Varieties
None

Sources
Sri Lanka, Brazil, Uruguay, Russia, Mexico, Zimbabwe - Rhodesia, Zambia, Arizona.

Toughness
Good

History
The word amethyst comes from the Greek amethustos meaning "not drunk". Therefore, it has been considered a charm against intoxication. A legend accounts for the origin of the stone. Supposedly, Bacchus, the god of wine and conviviality, grew angry at a slight and swore revenge. He decreed that the first mortal to come across his path was to be eaten by tigers. Amethyst, a beautiful maiden on her way to worship at the shrine of Diana, happened to be the victim. Diana, the huntress, changed Amethyst into colourless quartz to protect her from the tigers. When Bacchus witnessed the miracle, he repented and poured wine over the stone, staining it purple. The wine failed to cover the entire stone evenly, and the feet and part of the legs remained clear crystal. So, in keeping with the legend, amethyst crystals are usually uneven in colour with a colourless base.
Cuts & Uses Must be cut in a cabochon to produce cat's eye effect. This should be cut so that the long portion of the cabochon is 90 degrees to the direction of the needles.



Citrine


Description
A transparent variety of quartz, silicon dioxide, occurring in yellow to red-orange to orange-brown. The name is derived from citron, which is French for lemon.

Varieties
Madeira (deep, bright reddish-brown) and Palmyra (medium yellowish-brown) are terms used in the trade.

Sources
Brazil, Madagascar, Russia, Sri Lanka.

Toughness
Good

Treatments
Poor quality amethyst is often heat-treated to achieve a desirable citrine colour.

Cuts & Uses
Usually fashioned into ring and pendant stones. The per carat value of cut citrine usually decreases beyond the size of an average ring stone.



Aquamarine



Aquamarine is a blue to greenish-blue or bluish-green variety of beryl.

Varieties
May occasionally exhibit a cat's eye effect (chatoyancy).

Sources
Sri Lanka, Brazil, Madagascar (only historically), Tanzania, Russia, Kenya, Afghanistan, Nigeria.

Toughness
Good

Treatments
Almost all aquamarine is heat-treated to enhance its blue colour. Irradiation with neutron, gamma rays or with x-rays. Colour change is permanent and is an accepted practice. A morganite (pink beryl) turns deep purple blue (Maxixe type) upon ultraviolet irradiation, though the colour is not stable.

History
The word aquamarine comes from the Latin for sea water. In 1910 a 243 lb. crystal was found in Brazil. The outside was greenish and the inside was blue. It sold for $25,000 and was cut into many high quality gems. The American Museum of Natural History has a 13 lb. uncut piece of the green outside portion.

Cuts & Uses
The step-cut is the most popular because it accentuates the colour. As it is often found in large, flawless, even-colored crystals, it is frequently used in pendants and rings. Given a piece of rough with a certain colour intensity, the larger stones cut from it will exhibit deeper colour.
Other Information Aquamarine is the blue, or perhaps more correctly, blue-green or aqua variety of the mineral beryl. Other gemstone colour varieties that belong to beryl include emerald, morganite, and heliodor. Other colours of beryl are simply referred to by their colour, such as red beryl. Most gem aquamarines have been heat treated to produce the popular blue-green varieties from less desirable yellow or pale stones.





Garnet



A group of gemstones occurring in every colour but blue. One of earth's most common minerals, though only a small portion is considered gem quality.

Species
Rhodolite- violet to purplish-red;
Almandite - red, brownish-red, violetish-red or purple;
Pyrope ? red;
Grossularite - green, yellow, brown, white, colourless, light violet, red, orangey-red; Varieties: hessonite (orange to brown), transparent, green, grossularite (tsavorite);
Some show a colour change from a mauve-brown to orange-red.
Andradite - green, yellow, black. Green called demantoid (high lustre and dispersion);
Spessartite - yellow to yellow-brown, dark orangey-brown, reddish-orange, orange;
Uvarovite - emerald green, found only in tiny sizes, usually opaque.

Sources
Rhodolite - Sri Lanka, North Carolina, Tanzania, Kenya, South Africa, Brazil.
Almandite - Sri Lanka, India, Brazil, star from Idaho - USA.
Pyrope - Czechoslovakia, South Africa, Zimbabwe - Rhodesia, Brazil, Arizona.
Grossularite - Sri Lanka, Brazil, Tanzania, Kenya, South Africa, Canada.
Andradite - demantoid: Russia, Italy; translucent yellowish or greenish-brown, Arizona.
Spessartite - Sri Lanka, Burma, Brazil, Madagascar, Tanzania, Kenya.
Uvarovite - Russia, Finland (hardly mined at all).

Toughness
Fair to good

History
Since earliest times garnets have been carried as amulets against accidents in travel. Asiatic peoples and even our Southwest Indians used them as bullets, believing that their rich, glowing colour might cause more deadly wounds. The Persians have given the garnet a favoured place as a royal stone, allowing it to bear their sovereign's image. Red garnet was once used to relieve fever, yellow garnet to cure jaundice. If the powder failed, the apothecary was accused of using a substitute.

Cuts & Uses
Usually faceted. Sometimes carved into intaglios.


Tourmaline


 

Tourmaline is a group of minerals comprised of a complex boron-aluminum silicate with one or more of the following: magnesium, sodium, lithium, iron, potassium or other metals. It appears in light from dark red to purple as well as brownish variations of these hues - light to dark green, yellowish-green, greenish-yellow, brownish-orange. It also grows bi-coloured.

Varieties
Bi-coloured, watermelon, cat's eye, alexandrite-like (rare) .

Sources
Sri Lanka, Brazil, USA (California, Maine), Madagascar, Tanzania, Kenya, Russia, Afghanistan, Pakistan (prime new source).

History
Dutch children played with tourmaline because of its ability to attract light objects. The stones were called "aschentrekkers" (ash drawers).

Cuts & Uses
Any cut may be used. Some are carved, some fashioned into beads. Cat's eye are always cut en cabochon. Sometimes carved to make use of more than one colour.



Spinel

 
A magnesium aluminum oxide which occurs in all colours, ruby-red being the most popular. Most colours are greyed out. Gahno-spinel is a dark blue or greenish-blue spinel with high zinc content.

Varieties
Star material is very rare.

Sources
Sri Lanka, Burma, Minor-Anatolia, Afghanistan, Brazil, Thailand, Australia.
Toughness Good

History
Two of the stones among the Crown Jewels of England are spinels, although they were once thought to be rubies. They are the Black Prince's Ruby and the Timur Ruby. The 361 carat Timur Ruby is the world's most famous spinel. Spinel was recognized as a separate species as early as 1587 in Burma.

Cuts & Uses
Usually faceted.


Topaz

Topaz is a fluosilicate of aluminum, occurring in transparent yellow, yellow-brown, orange-brown, light to almost medium red, very light to light blue, very light green and violet colours.

Varieties
 

Coloured varieties, Imperial (reddish-orange), chatoyant material (very rare).

Sources
Prime source is Brazil. Sri Lanka (blue), Mexico (mostly poor quality, brownish-yellow), Russia, South Africa (blue), Utah, Afghanistan.

Toughness
Poor, extremely easy basal cleavage - treat with care.

History
The stone began to be used in Marco Polo's time (13th century). Topaz mounted in gold and hung around the neck was believed to dispel enchantment. When the powdered stone was put in wine, it was considered a cure for asthma, insomnia, burns and haemorrhages. Topaz was supposed to become obscure in contact with poison and to quench the heat of boiling water. All these powers were believed to be increased or decreased with the changes of the moon.

Cuts & Uses
Usually faceted, often mixed cut due to long prismatic shape of crystal; some stones cut as longish oval or pendeloque stones. The moderately rich colored stones are emerald cut.



Moonstone

Moonstones are usually colourless to white, semi-transparent to translucent, and characterised by a glowing light effect known as adularescence, the visibility of which is confined to a restricted angle of view. The most valuable of the feldspar gems.

Varieties
Some may exhibit cat's eye effect.

Sources
Sri Lanka, Switzerland, Burma, United States, Madagascar, Tanzania.
Phenomena Adularescence- a glowing effect, the finest of which is bluish. Finest quality moonstone is semi-transparent; poorest is translucent. Occasionally a sharp cat's eye may be present.

Toughness
Poor

History
Considered a love charm, moonstone has been attributed the power to arouse tender passions and foretell the future. Therapeutic qualities include protection from lunacy, appeaser of anger and relief from fever.

Cuts & Uses
Usually en cabochon, sometimes carved into


Zircon

Zircon is a zirconium silicate, occurring in colourless, light blue, brownish-orange, yellow, yellowish-green, brownish-green, dark red or light red-violet. Blue is the most valuable. This stone is usually heat-treated.

Varieties
High, medium and low property.

Sources
Sri Lanka, Burma, Cambodia, Thailand.
Precautions Avoid heat. Boiling and steaming not recommended.

History
The terms hyacinth or jacinth were often applied to the reddish-brown zircon. During the Middle Ages, hyacinth was claimed to have the power of inducing sleep, of promoting riches, honour and wisdom and of driving away plagues and evil spirits. The pale yellow to colourless stones from Ceylon (Sri Lanka) were called jargoons.

Cuts & Uses
The round brilliant cut is most successful, standard 57-facets with no cul
et.


Peridot

Peridot is a silicate of magnesium and iron, occurring in yellowish-green, green, greenish-yellow, brownish-green and brown (all transparent).

Varieties
Peridot top grades: medium to dark, slightly yellowish-green. Chrysolite ? greenish-yellow, light to dark yellowish-green to brownish-green to almost brown.

Sources
Sri Lanka, Island of Zeberget (Egypt), Burma, USA, Mexico.

Toughness
Fair to good

History
The ancients called it the "gem of the sun." They attributed to it the power to dispel enchantment and evil spirits due to its association with the sun (which drives away darkness). In order to be worn as a talisman, it had to be set in gold. The Red Sea island of Zeberget, off the southern tip of Egypt, was worked for this stone as early as 1500 B.C. At that time, the island was known as "The Island of Serpents," because it was infested with poisonous snakes. Later, the reigning Egyptian king had the snakes destroyed to facilitate prospecting for peridot. Prospecting was done at night because the gem could not be seen in sunlight. The workers would mark the spots and return the next day to dig them out.

Cuts & Uses
Usually faceted. Step-cut is best; oval, round and pendeloque cuts are common. Very suitable for brooches, pendants, earrings, but not for rings or bracelets because it abrades easily.



Blue Giant of the Orient (466 carats)

Mined in Kuruwita in 1907, this giant blue sapphire is one of the world's most valuable gemstones. In rough, it was said to have been over 600 carats and was fashioned into a jewel of 466 carats. It is the largest blue sapphire in the world. This gem is in the collection of an American gem and art collector.





Logan Blue Sapphire (423 carats)

Considered to be the second largest blue sapphire in the world on record. A flawless specimen with a rich deep blue, the stone was gifted to The Smithsonian Institute in Washington DC by John Logan.




Star of India (563 carats)

The second largest star sapphire in the world was discovered in Sri Lanka. It is almost flawless and unusual in that it has stars on both sides of the stone. Part of the collection of the American Museum of Natural history.


Star of Lanka (362 carats)

Third largest star sapphire on record. The phenomenal stone is a rich deep-blue in colour and has a well-defined six-ray star. Owned by the National Gem & Jewellery Authority in Sri Lanka.


Rosser Reeves Star Ruby (138 carats)

The world's largest star ruby combining excellent colour, good transparency and a well-defined star. Part of the United States National Gem Collection at the Smithsonian Institute.




Hope Cat's Eye (over 500 carats)

Probably the largest chrysoberyl cat's eye in the world, it was previously part of the collection of Thomas Hope, the wealthy British banker and gem investor. This cat's eye is carved to represent an alter surmounted by a torch. Exhibited at the British Museum of Natural History.




Ray of Treasure (103 carats)

The stone displays the most desirable qualities of a "milk and honey" effect, with good transparency and a well-defined silvery star. An almost flawless specimen, its cut and proportions are excellent. It is part of the collection of the Sri Lanka National Gem & Jewellery Authority.