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Spring 2000 Gem News International

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

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Pinctada margaritifera (black-lipped pearl oyster) shells together
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Non-Bead-Cultured Pearls from Pinctada margaritifera

GIA’s Bangkok laboratory examined the internal and spectroscopic features of 120 cultured pearl samples, all stated to be non-bead-cultured pearls of “Tahitian” origin. Most showed spectral features that suggest they were produced by the Pinctada margaritifera mollusk, though some were bead-cultured pearls were mixed in with the samples.

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Real-Time Microradiography of Pearls: A Comparison Between Detectors

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

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This 20.60 ct specimen was purchased by the client as a “natural white pearl.”
Filled Pearl with Surface Features

A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.

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Natural freshwater pearl with form of a fish.
Natural Freshwater “Fish” Pearl

A uniquely shaped freshwater pearl is examined in the New York lab.

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A pair of pearl and diamond earrings set with one CVD synthetic melee.
A Melee-Sized CVD Synthetic Diamond in Pearl and Diamond Jewelry

A CVD-grown melee is found in a pearl and diamond earring.

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Pink “rosebud” conch pearls.
Natural Conch “Rosebud” Pearls

Unique natural conch pearls are studied in the New York lab.

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Two Tridacna species shells with blister pearls.
Partially Hollow Tridacna Blister Pearls with Shells Attached

Blister pearls attached to shells are seen in both the Bangkok and New York laboratories.

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Loose pearls submitted for identification.
Atypical Bead-Cultured Pearls with Unusual Nacre Growth

Bead-cultured pearls with growth patterns within the drill holes are seen in the New York lab.

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Sango pearls and coral bead.
“Sango Pearl” from Japan

A study of a pink Japanese akoya cultured pearl yields information about the material’s color origin.

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