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2. Pinctada fucata - Wikipedia

   en.wikipedia.org/wiki/Pinctada_fucata

   Pinctada fucata. Pinctada fucata, the Akoya pearl oyster (阿古屋貝), is a species of marine bivalve mollusk in the family Pteriidae, the pearl oysters. Some authorities classify this oyster as Pinctada fucata martensii (Gould, 1850). [1] It is native to shallow waters in the Indo-Pacific region and is used in the culture of pearls.

3. 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.

4. Keshi pearl - Wikipedia

   en.wikipedia.org/wiki/Keshi_pearl

   Keshi pearls consist of solid nacre, and tend to have high luster as a result. All nacre colors typical of the mollusc under cultivation may be represented among keshi pearls harvested from the same, but in the case of Akoya pearls a larger portion of keshi is usually grey than of bead-nucleated pearls.

5. Pearl - Wikipedia

   en.wikipedia.org/wiki/Pearl

   The original Japanese cultured pearls, known as akoya pearls, are produced by a species of small pearl oyster, Pinctada fucata martensii, which is no bigger than 6 to 8 cm (2.4 to 3.1 in) in size, hence akoya pearls larger than 10 mm in diameter are extremely rare and highly priced. Today, a hybrid mollusk is used in both Japan and China in the ...

6. Pinctada - Wikipedia

   en.wikipedia.org/wiki/Pinctada

   Pinctada is a genus of saltwater oysters, marine bivalve mollusks in the family Pteriidae. These pearl oysters have a strong inner shell layer composed of nacre, also known as "mother of pearl". Pearl oysters are not closely related to either the edible oysters of family Ostreidae or the freshwater pearl mussels of the families Unionidae and ...

7. Baroque pearl - Wikipedia

   en.wikipedia.org/wiki/Baroque_pearl

   Baroque pearls are pearls with an irregular, non-spherical shape. [1][2] Shapes can range from minor aberrations to distinctly ovoid, curved, pinched, or lumpy shapes. Most cultured freshwater pearls are baroque because freshwater pearls are mantle-tissue nucleated instead of bead nucleated. Cultured saltwater pearls can also be baroque, but ...