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2. Tahitian pearl - Wikipedia

   en.wikipedia.org/wiki/Tahitian_pearl

   The cultured Tahitian pearl comes in various shapes, sizes, and colors; shapes include round, semi-round, button, circle, oval, teardrop, semi-baroque and baroque. [4] Because of their darker hues, Tahitian pearls are commonly known as "black pearls". [5] However, Tahitian pearls have the ability to contain various undertones and overtones of ...

3. Pearl - Wikipedia

   en.wikipedia.org/wiki/Pearl

   Georgian seed pearl gold ring. 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 fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [3] in minute ...

4. Pinctada maxima - Wikipedia

   en.wikipedia.org/wiki/Pinctada_maxima

   Pinctada maxima is a species of pearl oyster, a marine bivalve mollusk in the family Pteriidae, the pearl oysters. There are two different color varieties: the Gold-lipped oyster and the Silver-lipped oyster. These bivalves are the largest pearl oysters in the world. They have a very strong inner shell layer composed of nacre, also known as ...

5. Baroque pearl - Wikipedia

   en.wikipedia.org/wiki/Baroque_pearl

   Most Tahitian pearl farm harvests, which, for example, produce more than 40 percent baroque and semi-baroque pearls. Western Australia is currently the world's largest cultivator of pearls from Pinctada maxima gold-lipped oysters, whereas Tahiti is the number one cultivator of pearls from Pinctada margaritifera black-lipped oysters.

6. Pinctada - Wikipedia

   en.wikipedia.org/wiki/Pinctada

   Black South Sea pearls, or Tahitian pearls come from the black-lip oyster; gold and silver South Sea pearls from the gold-lip and silver-lip oysters; and Akoya cultured pearls from Pinctada fucata martensii, the Akoya pearl oyster. Pearls are also obtained in commercial quantities from some species of the closely related winged oyster genus Pteria.

7. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   If the gold layer is 12 kt or higher, the minimum layer of karat gold in an item stamped gold-filled marks must equal at least 1 ⁄ 20th the total weight of the item. The most common stamps found on gold-filled jewelry are 1 ⁄ 20th 12kt GF and 1 ⁄ 20th 14kt GF. Also common is 1 ⁄ 10th 10kt. These standards are for modern gold-filled items.