Bleaching, dying, and polishing is usually done. Except for the old Arabic practice of sun-bleaching in the Persian Gulf, naturals were practically never processed. Chinese pearls that are nearly white or mottled are usually bleached to make them whiter and more uniform. With the same methods perfected by the Japanese, the Chinese use a mild bleach, bright fluorescent lights, and heat. They polish surfaces by tumbling pearls in pumice or similar substances. The idea, as always, is to facilitate matching pearls for strands. Many Chinese pearls used to be dyed in the 1980s to bright red, blue, lavender, yellow or even black. In response to contemporary preferences, they now offer a selection of subtle natural colors. The Chinese have also begun to nucleate some of their freshwater mussels with shell nuclei implants in both the creatures' bodies as well as in their mantles. Such practices, once perceived as "saltwater culturing techniques," are a new cultural revolution. How will buyers react who had been told that cultured freshwater pearls were all-nacre products? Will they buy Chinese pearls if the roundest examples are nacre-coated shell beads instead? How will such new products be positioned in the market? Will anyone, including gem testing labs, be able to tell the difference between tissue-nucleated and bead-nucleated freshwater pearls?
Those are serious new considerations. Even more disquieting is the second innovation. The Chinese are nucleating mussels with their own tissue-cultured freshwater pearls, which result in all-nacre round or almost round pearls. Aiming for an even higher percentage of rounds, the Chinese are even reshaping reject freshwater pearls into spheres, then nucleating mussels with them.
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Orignal From: Bleaching, dying, and polishing is usually
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