The first known group of colour-change gem-quality chrome grossular garnet, reportedly from Ethiopia, is examined in GIA’s Carlsbad lab.
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An update the gemmological and chemical characteristics of golden sheen sapphires from Kenya.
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A transparent greenish-blue pear-shaped gemstone, reportedly from Madagascar, is discovered to be a Maxixe-type beryl.
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Four amethyst cabochons are unique due to inclusions that create a trapiche-like appearance.
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A black star sapphire produced from eastern Thailand, showing both golden and silver rays, is studied at GIA’s Bangkok lab.
Read MoreA Peruvian source yields a new azurite-malachite mixture.
Read MoreA report from the fifth World of Gems Conference, held on 23-24 September at the Loews Hotel in Chicago.
Read MoreThe 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.
Read MoreObservations on a black diamond with an unusual inclusion pattern lead to theories on growth.
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