Find out about how GIA is addressing industry concerns over undisclosed laboratory-grown and simulated fancy melee being mixed in with natural fancy melee.
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Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference
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GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.
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Characterises the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricata fucata molluscs.
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Learn about Mozambican rubies, including their mining history, characteristics and market demand.
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GIA researchers in New York recently had the opportunity to examine one of the most interesting and unique diamond crystals ever found.
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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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GIA researchers analysed more than 90,000 natural pink diamonds to better understand how these rare and beautiful diamonds formed and got their colour.
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A stone submitted for identification is revealed to be the first wurtzite examined by the GIA lab.
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Purplish Pink Spinel from Tajikistan: Before and After Cutting
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