A tapered baguette-cut diamond exhibits two major color zones.
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The Carlsbad lab examines a rare submission of a Fancy Dark brown diamond containing carbon dioxide.
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A diamond shaped like a cricket bat is submitted to GIA’s Mumbai laboratory.
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A Fancy Deep brownish orange treated HPHT-grown diamond exhibits multiple defect concentrations in various growth sectors.
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Examination of a brown nacreous pearl reveals a pair of foraminifera-like spheres.
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The Carlsbad laboratory reports on a strand of 78 light bluish gray pearls submitted for identification.
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A report on the identification of three large baroque pearls submitted to the Mumbai laboratory.
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GIA’s Mumbai laboratory analyzes seed pearls decorating an Indian-style headdress.
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Investigation of a tubular feature in a natural pearl reveals evidence of parasitic activity.
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A rare and exceptional example of sodalite is studied in the Bangkok laboratory.
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past gems & gemology issues
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Volume 59, Issue 4
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