Trigons and tetragons observed in a chameleon diamond indicate both octahedral and cubic growth.
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A rare observation of spatially distinct red and greenish blue phosphorescence in a natural diamond.
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A natural type IIa diamond displays a unique fluorescence pattern when exposed to deep-UV light.
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The first report of an etch channel–like structure in a CVD laboratory-grown diamond submitted to GIA.
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A CVD-grown diamond submitted to GIA requires very careful examination to determine its origin.
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The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.
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GIA’s Mumbai laboratory reports on the examination of an 80-year-old collection of pearls from the Arabian (Persian) Gulf.
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A white button-shaped nacreous pearl displays rare flame-like structure.
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Two Indian-style pearl nose rings are examined in the Mumbai laboratory.
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Fingerprints resulting from a flux-assisted heating process give a purple-red ruby a unique appearance.
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