A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.
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Analysis reveals blue lead glass filling in a sapphire that has an overall green bodycolour as a result of the filling’s combination with natural yellow colour.
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A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.
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This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
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