In this study, the Bangkok laboratory examined five low-quality bead cultured pearls sourced directly from a local pearl factory and characterised their features before and after processing.
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Recently, GIA’s laboratory in New York had the opportunity to examine a fascinating pearl find and hear about an even more fascinating story.
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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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John Latendresse is known as the father of American cultured pearls. He was also a great natural pearl collector and left his family a remarkable natural pearl collection. The Latendresse family is well recognised in the American pearl industry and has long supported GIA pearl research. Come with us to revisit this family and their pearl collection.
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Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.
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Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.
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Screening reveals a surprise within a batch of synthetic diamond melee.
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Examination of aquamarine samples from a new primary deposit in San Luis Potosí, northern Mexico.
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Reviews the properties of exceptionally pure grandidierite from a new source.
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