A vivid cobalt blue spinel from Vietnam contains the first reported inclusion of actinolite in spinel.
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The GIA lab examines five gem-quality CVD-grown diamonds in sizes that reflect the improving technology of the synthetic gemstone industry.
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Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.
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The examination of two unusual garnets results in identifications issued for the first time in GIA's colored stone report records.
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Though long underappreciated, Australian sapphires could see a resurgence with the arrival of Fura Gems, a major mining and marketing company.
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In this study, the Bangkok laboratory examined five low-quality bead cultured pearls sourced directly from a local pearl factory and characterized 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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A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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Presents a visual guide to the growth processes and major gemological spectroscopic features of synthetic diamonds.
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Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original color through the use of incandescent light.
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