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2. Pearl - Wikipedia

   en.wikipedia.org/wiki/Pearl

   One family of nacreous pearl bivalves – the pearl oyster – lives in the sea, while the other – a very different group of bivalves – lives in freshwater; these are the river mussels such as the freshwater pearl mussel. Saltwater pearls can grow in several species of marine pearl oysters in the family Pteriidae.

3. List of pearls by size - Wikipedia

   en.wikipedia.org/wiki/List_of_pearls_by_size

   A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a conulariid.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [1] in minute crystalline form, which has been deposited in concentric layers.

4. Cultured pearl - Wikipedia

   en.wikipedia.org/wiki/Cultured_pearl

   The cultured pearls on the market today can be divided into two categories. The first category covers the beaded cultured pearls, including Akoya, South Sea, Tahiti, and the large, modern freshwater pearl, the Edison pearl. These pearls are gonad-grown, and usually one pearl is grown at a time. This limits the number of pearls at a harvest period.

5. Are These the Most Beautiful Pearls in the World? - AOL

   www.aol.com/most-beautiful-pearls-world...

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6. Tahitian pearl - Wikipedia

   en.wikipedia.org/wiki/Tahitian_pearl

   Tahitian pearls in bulk. The Tahitian pearl (or black pearl) is an organic gem formed from the black lip oyster (Pinctada margaritifera). [1] These pearls derive their name from the fact that they are primarily cultivated around the islands of French Polynesia, around Tahiti.

7. Oyster - Wikipedia

   en.wikipedia.org/wiki/Oyster

   Pearls can form in both saltwater and freshwater environments. Pearl oysters are not closely related to true oysters, being members of a distinct family, the feathered oysters . Both cultured pearls and natural pearls can be extracted from pearl oysters, though other molluscs, such as the freshwater mussels, also yield pearls of commercial value.