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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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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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The History and Gemmology of Queen Conch "Pearls"

This article reviews the history of the conch "pearl," discusses S. gigas and its fisheries, and examines the gemmological properties and other characteristics of this attractive material.

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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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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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The Pearl in the Chicken: Pearl Recipes in Papyrus Holmiensis

Several pearl-in-chicken cleaning experiments are carried out to test the validity of recipes from an ancient Egyptian source.

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