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2. Cultured freshwater pearls - Wikipedia

   en.wikipedia.org/wiki/Cultured_freshwater_pearls

   Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are produced in Japan and the United States on a limited scale, but are now almost exclusively produced in China. The U.S. Federal Trade Commission requires that farmed freshwater pearls be referred to as "freshwater cultured pearls" in ...

3. Pearl - Wikipedia

   en.wikipedia.org/wiki/Pearl

   The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable, and valuable. The most valuable pearls occur spontaneously in the wild but are extremely rare. These wild pearls are referred to as natural pearls.

4. Baroque pearl - Wikipedia

   en.wikipedia.org/wiki/Baroque_pearl

   Pearl jewelry stores may bleach or dye freshwater cultured pearls after harvesting to enhance their color. The most valuable baroque pearls are the South Sea and the Tahitian pearls , which are produced by Pinctada margaritifera (black-lipped oysters ) and Pinctada maxima (gold-lipped and silver-lipped oysters).

5. Tahitian pearl - Wikipedia

   en.wikipedia.org/wiki/Tahitian_pearl

   Tahitian pearls come in a range of colors from white to black. [2] They can contain various undertones and overtones of green, pink, blue, silver and yellow. The most valuable of these are of the darker variety, as the naturally dark tones of the Tahitian pearls is a unique quality among pearls.

6. Keshi pearl - Wikipedia

   en.wikipedia.org/wiki/Keshi_pearl

   Originally, keshi pearls referred to those pearls formed when a bead nucleus was rejected. More recently, keshi has been used to refer to second harvest pearls and even to freshwater non-nucleated pearls. However the later usage referring to freshwater pearls is considered erroneous by many leading gem trade associations. [1]

7. Cultured pearl - Wikipedia

   en.wikipedia.org/wiki/Cultured_pearl

   Cultured pearls are pearls which are formed within a cultured pearl sac with human intervention in the interior of productive living molluscs in a variety of conditions depending upon the mollusc and the goals. [1] Having the same material as natural pearls, cultured pearls can be cultivated in seawater or freshwater bodies. Over 95% of the ...