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Three cultured pearls, one natural
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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Bracelet containing akoya cultured pearls from Australia
Akoya Cultured Pearl Farming in Eastern Australia

Characterises the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricata fucata molluscs.

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Eight natural-color pistachio pearls
Identification of “Pistachio” Coloured Pearls Treated by Ballerina Pearl Co.

A report on the colour treatment process for these intensely greenish yellow to yellowish-green cultured pearls and the techniques for identifying them.

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Non-nacreous Pen Pearls
Observations on Pearls Reportedly from the Pinnidae Family (Pen Pearls)

Examines the internal structure, chemical composition and spectroscopic features of 22 pen pearls.

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Winter 2011 G&G Lab Notes

This section, from the Winter 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Cultured Pearls from the Gulf of California, Mexico

Black pearls have been found in Mexico’s Gulf of California since the area was settled more than 2,000 years ago.

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Update on the Identification of Treated “Golden” South Sea Cultured Pearls

This study demonstrates how atypical absorption features, particularly in the blue region of the spectrum, can be used to positively identify colour treatment.

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Identification of Yellow Cultured Pearls from the Black-Lipped Oyster Pinctada Margaritifera

Although the Pinctada margaritifera oyster usually is associated with the black pearls cultured in French Polynesia, it also can produce attractive large yellow cultured pearls.

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Spectral Reflectance and Fluorescence Characteristics of Natural-Colour and Heat-Treated “Golden” South Sea Cultured Pearls

A comparison study was made between the yellow and white nacre of the gold-lipped Pinctada maxima oyster shell and 65 yellow cultured pearls.

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The Current Status of Chinese Freshwater Cultured Pearls

Chinese freshwater cultured pearls (FWCPs) are assuming a growing role at major gem and jewellery fairs, and in the market at large.

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