G&G announces the winners of the Dr Edward J. Gübelin Most Valuable Article Awards for 2019.
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Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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Trapiche emeralds, which display a distinct six-spoke wheel pattern, set the standard as some of the finest and most spectacular crystals ever unearthed.
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A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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An update the gemmological and chemical characteristics of golden sheen sapphires from Kenya.
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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.
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For the first time, the Carlsbad and New York labs see natural sapphire seeds with synthetic ruby overgrowth.
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A sapphire with a colour not commonly seen in the lab is found to have a glass filling.
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GIA examines a multi-elemental diffused and melt-grown synthetic sapphire for the first time.
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Sapphires from Baw Mar host multiphase inclusions in appealing patterns.
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