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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.
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 ...
Serendibite was discovered in Sri Lanka by Sunil Palitha Gunasekera in 1902 and named after Serendib, the old Arabic name for Sri Lanka. Zektzerite was discovered by Bart Cannon in 1968 on Kangaroo Ridge near Washington Pass in Okanogan County, Washington, USA. The mineral was named in honor of mathematician and geologist Jack Zektzer, who ...
Ringsrud has a background in emerald gemology and the world emerald market. He has given presentations and lectures on the topic since 1986. [2] As the owner of Ronald Ringsrud Company, he was the host and guide in Bogotá, Colombia, for foreign buyers visiting the city's emerald marketplace, as well as guiding groups from the L.A. County Museum of Natural History and the Gemological Institute ...
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 ...
This is a list of geoscience organizations, including such fields of geosciences as geology, geophysics, hydrology, oceanography, petrophysics, and related fields. [ 1 ] [ 2 ] [ 3 ] Intercontinental organizations
On June 28, 1940, Liddicoat joined the staff of GIA as an Assistant Director of Education. About a year later, in fall 1941, Liddicoat helped develop the Diamolite, and also published, alongside Robert M. Shipley, his first article for Gems & Gemology; "A Solution to Diamond Color Grading Problems".
The sapphire itself was mined in Burma (now Myanmar), and was purchased by the Countess in Sri Lanka in 1926 during her honeymoon with Harrison Williams. The necklace consists of a single chain of platinum links connected by pairs of round brilliant cut diamonds .