pearl colors can be treated to alter their appearance. The most common color treatment is dyeing, and it is more common with freshwater pearls than saltwater pearls. While freshwater pearls do come in ...
These four atypical freshwater ... pearls,” Summer 2011 G&G, pp. 149–150). Two did not show any distinct internal demarcation when examined with X-radiography in various directions (figure 2). This ...
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