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.
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.
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.
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.
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.
Freshwater Pearls of North America
The American freshwater pearl industry and its new entry, the freshwater cultured pearl.
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).
Abstracts; Autumn 1991
This article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.