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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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Titanium-Bearing Synthetic Alexandrite and Chrysoberyl

Overview and commentary on the 2013 Journal of Gemmology article “Titanium-Bearing Synthetic Alexandrite and Chrysoberyl.”

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Giant Clam Pearl
A Large Baroque Tridacna Gigas (Giant Clam) Pearl

This giant clam pearl was noteworthy for its size and interesting coloration, and its pronounced banding when viewed with transmitted light.

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Karampelas
Gemological Characteristics of Saltwater Cultured Pearls Produced After Xenotransplantation

Spectroscopic and radiographic study of experimental saltwater cultured pearls produced from xenotransplantation between P. margaritifera and P. maxima.

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 Zuowei
A Comparison of Modern and Fossil Ivories Using Multiple Techniques

This article provides identification criteria to distinguish between modern and fossil (mammoth) elephant ivory.

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Orangy Pink Coated "Soft Coral"

A coral specimen that was coated—not dyed—with a coloring agent only on the surface, an unusual method evidenced by microscopic features.

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Strands of Tiny Akoya Keshi Pearls

Tiny pearls only 0.7–0.9 mm in diameter presented in Tuscon by the Japanese Pearl Exporting Company.

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Calcium Fluoride Coating Found on 13 "Fancy" Pink Diamonds

Recent lab examination reveals that traditional treatments such as calcium fluoride coating are still prevalent in the trade, and great care must be taken to identify them.

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Atypical Freshwater Cultured Pearls with Damaged Nacre

The New York lab received four baroque-shaped pearls with damaged nacre layers

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Perles de Culture de la Mer de Cortez: Les Belles Inconnues [Unknown Beauties: Cultured Pearls from the Cortez Sea]

The first part of the article gives a historical survey of the Cortez Sea (Gulf of California) pearls, followed by an account of the actual situation.

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