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Sri Lanka's 'Geuda sapphire' is a semi-opaque milk-white stone that can be heated to a deep blue. The gem trading center for Sri Lanka is in the town of Ratnapura (Singhalese for "gem town"), about 100 kilometers southeast of the capital, Colombo. Heat Treated Material from Sri Lanka.

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Spinel is a gemstone found in greater abundance in Sri Lanka than either corundum or chrysoberyl. Its very abundance makes Sri Lanka the second largest producer of this stone next to Myanmar (Burma). Sri Lankan spinel range from ruby red, pink, orange, shades of reddish brown, purple, blue, bluish green, mauve, greenish black, black to colorless.

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Sri Lanka is the second largest supplier of spinel to the global gem and jewellery market with colours ranging from ruby red, pink, orange, shades of reddish-brown, purple, blue, bluish-green, mauve, greenish-black, black to colourless. The occurrence of natural blue spinel coloured by cobalt has been found in Sri Lanka.

Sri Lanka is best known for its large, exceptional sapphire and star corundum. Important stones reported to be from Sri Lanka include (Ariyaratna, 2013): the 466 ct Blue Giant of the Orient, supposedly mined from the Ratnapura area in 1907

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Geuda (ගෙවුඩ, pronounced gay-yoo-dah) is a form of the mineral corundum, or sapphire, found primarily in Sri Lanka.Around 70%-80% of gems mined in Sri Lanka belong to geuda varieties. Because of its semitransparent and milky appearance due to rutile inclusions, these stones have little value as gemstones in their natural state.. Geuda was frequently stored in large drums or used to ...

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Red corundum is known as ruby. One variety of sapphire, called star sapphire, has 6 and occasionally 12 rays. The color variety of sapphire ranges from violet through blue, green, yellow, orange, pink, purple, colorless, brown, gray and black. They can be bi- or parti-colored and can show color change. Star sapphire can occur in any of the colors.

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Pigeon's Blood red rubies typically originate from Burma, but other noteworthy localities of high quality ruby are found in Vietnam, Sri Lanka, and Thailand. The highest quality rubies will show a strong red fluorescence and sometimes contain fine rutile silk that scatters the light across the stone, displaying a full bodied colour.

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Sapphire miners were able to sell low-quality material for better prices which provided a boost to the mining industry. The Sri Lankan geuda sapphire, a pale, translucent, and, until heat treatment, useless variety of corundum, could be heated into a striking blue stone. As a result, the 1970s saw an enormous increase in blue Sri Lankan stones.

6.36 ct Corundum - Sapphire Sri Lanka (PDF) 33061 7.74 ct Corundum - Sapphire Sri Lanka (PDF) 33063 8.70 ct Corundum - Sapphire Sri Lanka (PDF) 33079 9.16 ct Corundum - Sapphire Sri Lanka (PDF) 35144 4.94 ct Corundum - Sapphire Thailand (PDF) 35128 5.28 ct Corundum - Sapphire Thailand (PDF) 33084 15.87 ct Corundum - Sapphire Sri Lanka (PDF) 33087

Sapphires from Thawa, Kataragama Area, Sri Lanka. cated by our observations of a few small blue sapphire SAPPHIRES FROM KATARAGAMA, SRI LANKA GEMS & GEMOLOGY SUMMER 2012 101 Figure 7. Pegmatitic intrusions with associated mica- ceous layers host the corundum mineralization at Thawa.

The most valuable precious stones found in Sri Lanka are corundum, a mineral family which includes sapphires and rubies. Sapphires range in colour from blue to as clear as a diamond. Sri Lankan rubies are "pink rubies" (also known as pink sapphires); the better-known red rubies are not found in the island. Garnets, popularly known as the "poor man's ruby", and ranging in colour from ...

The corundum family of gemstones consists of ruby and sapphire. Corundum is very compact, dense, and lacks gemstone cleavage. It's also the second hardest natural mineral after diamond. Gem-quality corundum is also quite rare. These factors make both varieties of corundum some of the most highly desired jewelry stones.

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Blue Sapphire (Neelam) Blue Sapphire (Neelam) is an extremely valuable, blue coloured gemstone of the Corundum mineral family. Known as the most influential and active acting gemstone in Vedic astrology, it is very effective in Business, Career, Health & Marriage and achievement in a person's life.Natural blue sapphire (Neelam) generally comes from Sri-Lanka(Ceylon), Burma & Kashmir and is ...

Locality. Sri Lanka. Purchased in 1996. Sapphire is a blue, yellow, orange, pink, purple, green or clear variety of the mineral corundum. Pure corundum is colorless, but tiny amounts of impurity trapped in the crystals as they grow result in a range of vivid colors. Iron and titanium are responsible for the deep blue color of sapphires.

The name of corundum is derived from India, and it is the name of mineralogy. Gemologically, it is called ruby and sapphire. Myanmar, Sri Lanka, Thailand, Vietnam and Cambodia are the most important suppliers of high-quality rubies and sapphires in the world. Other producing countries include China, Australia, the United States and Tanzania.

Sri Lanka is the number one provider of fine quality star sapphires in all colors. The very first sapphires that were found were most likely cut into cabochons that showed a star effect. These stones contributed to the legend and lore of the power that these rare stones possessed. Still today Sri Lanka is the highest producer of star sapphires.

This discovery produced an instantaneous increase in the sapphire resource of Sri Lanka, and possibly similar increases in the sapphire resource in other parts of the world. Within a short time, similar heat treatment methods were being used on a variety of smoky …