Tuesday, February 26, 2019

Are baroque pearls expensive?

Baroque pearls are pearls with an irregular non-spherical shape. Shapes can range from minor aberrations to distinctly ovoid, curved, pinch, or lumpy shapes. Most cultured freshwater pearls are baroque because freshwater pearls are mantle-tissue nucleated instead of bead nucleated.
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The color pearl is a pale tint of off-white. It is a representation of the average color of a pearl. The first recorded use of pearl as a color name in English was in 1604. The color used in interior design when an off-white tint is desired.
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Natural pearls are formed by nature, more or less by chance. On the other hand,cultured pearls are human creations formed by inserting a tissue graft from a donor oyster, upon which a pearl sac forms, and the inner side precipitates calcium carbonate, in the form of nacre or "mother-of-pearl".
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Fresh oysters must be alive just before consumption or cooking. There is only one criterion: the oyster must be capable of tightly closing its shell. Open oystersshould be tapped on the shell; a live oyster will close up and is safe to eat.
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The Tahitian pearl (or black pearl) is an organic gem formed from the black lip oyster (Pinctada margaritifera). These pearls derive their name from the fact that they are primarily cultivated around the islands of French Polynesia, around Tahiti.
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Cultured freshwater pearls are pearls that are farmed and created usingfreshwater mussels. These pearls are produced in Japan and the United States on a limited scale, but are now almost exclusively produced in China.
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2.5 – 4.5
Pearl/Hardness (Mohs hardness scale)
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Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur.
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The outer layer of pearls and the inside layer of pearl oyster and freshwater pearl mussel shells are made of nacre. Other mollusc families that have a nacreous inner shell layer include marine gastropods such as the Haliotidae, the Trochidae and the Turbinidae.
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The nacre is continuously deposited onto the inner surface of the shell, the iridescent nacreous layer, commonly known as mother of pearl.
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A seashell or sea shell, also known simply as a shell, is a hard, protective outer layer created by an animal that lives in the sea. ... The shells of sea urchins arecalled "tests", and the moulted shells of crabs and lobsters are exuviae. While mostseashells are external, some cephalopods have internal shells.
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Nacre (/ˈneɪkÉ™r/ NAY-kÉ™r also /ˈnækrÉ™/ NAK-rÉ™), also known as mother of pearl, is an organic-inorganic composite material produced by some molluscs as an inner shell layer; it also makes up the outer coating of pearls. It is strong, resilient, andiridescent.
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