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Sri Lanka, geologically speaking is an extremely old country. Ninety percent of the rocks of the island are of Precambrian age, 560 million to 2,400 million years ago. The gems form in sedimentary residual gem deposits, eluvial deposits, metamorphic deposits, skarn and calcium-rich rocks. Nearly all the gem formations in Sri Lanka are located ...
The Gemological Institute of America (GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. [ 1 ] Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality.
Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early 1950s. Historically, all gemstones were graded using the naked eye. The GIA system included a major innovation: the introduction of 10x magnification as the standard for grading clarity.
Gemological Institute of America (GIA) was the first laboratory in America to issue modern diamond reports, [33] and is held in high regard amongst gemologists for its consistent, conservative grading. Diamond High Council (HRD) Official certification laboratory of the Belgian diamond industry, located in Antwerp. [34]
Pages in category "Gemology" The following 32 pages are in this category, out of 32 total. ... Gems & Gemology; Gems of Sri Lanka; Gemstone industry in Greenland;
Sri Lanka 392.52 carats Cushion Blue Anonymous owner Logan Sapphire [82] Sri Lanka 422.99 carats Cushion Blue National Museum of Natural History, Washington Queen Marie of Romania [83] Sri Lanka 478.68 carats Cushion Blue Anonymous owner Star of Adam [17] Sri Lanka, 2015 1404.49 carats Star Blue Anonymous owner Star of Bombay: Sri Lanka 182 ...
It is also fairly hard (7.5), but more importantly shows perceptible fire when cut, due to its high dispersion of 0.039. Colorless zircon has been mined in Sri Lanka for over 2,000 years; prior to the advent of modern mineralogy, colorless zircon was thought to be an inferior form of diamond. It was called "Matara diamond" after its source ...
Black star sapphire is found in Thailand, Cambodia, Tanzania, Australia, Sri Lanka, Sierra Leone, Laos and many other countries, although supply is growing continuously exhausted, and mine yields have decreased. [2] The mines on the Thai/Cambodia border were reported to be almost exhausted of clear high-value gems by the late 1990s.
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