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Purple and white non-nacreous pearls
Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species

Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusc.

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Large Fluorite Sphere
Fluorite Sphere with Phosphorescent Coating

A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.

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Three abalone pearls alongside South Sea bead-cultured pearl.
Three Unique Large Natural Pearls from Haliotis (Abalone) Species

Abalone pearls submitted to the New York lab provide insight into the range of colours and shapes this type of mollusc can produce.

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Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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Non-nacreous Pearls
Natural Pearls Reportedly from a Spondylus Species (“Thorny” Oyster)

A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.

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Loose natural pearl aggregates
Natural Pearl Aggregates from Pteria Molluscs

Ten loose pearls with interesting shapes and internal growth features were from Pteria-species molluscs.

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Baroque pearl with suspect ring
Assembled “Pearl” Filled with Wire

Microradiography reveals wire fillings within a “pearl” created from two separate specimens.

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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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