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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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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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Five-strand Natural Pearl Necklace
X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls

The distinction of natural from cultured pearls has traditionally been based on X-radiography.

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Update on the identification of dye treatment in yellow or “golden” cultured pearls
Update on the identification of dye treatment in yellow or “golden” cultured pearls

Dye treatments in yellow or “golden” cultured pearls have improved to the point where some samples show little surface evidence.

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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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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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Characteristics of Nuclei in Chinese Freshwater Cultured Pearls
Characteristics of Nuclei in Chinese Freshwater Cultured Pearls

There has been considerable debate in the gem trade concerning the nucleation procedures being used to grow large round Chinese freshwater cultured pearls.

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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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Cultured 3/4 Blister Pearls

This article describes the method of culturing these "pearls" as well as the differences between this material and 3/4 South Sea cultured pearls or assembled cultured blister pearls (Mabe pearls).

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