This study demonstrates how atypical absorption features, particularly in the blue region of the spectrum, can be used to positively identify colour treatment.
Read MoreAlthough the Pinctada margaritifera oyster usually is associated with the black pearls cultured in French Polynesia, it also can produce attractive large yellow cultured pearls.
Read MoreA comparison study was made between the yellow and white nacre of the gold-lipped Pinctada maxima oyster shell and 65 yellow cultured pearls.
Read MoreChinese 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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There has been considerable debate in the gem trade concerning the nucleation procedures being used to grow large round Chinese freshwater cultured pearls.
Read MoreThe American freshwater pearl industry and its new entry, the freshwater cultured pearl.
Read MoreThis 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).
Read MoreThis article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.
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