Tuesday, February 26, 2019

What is the composition of a pearl?

Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainlyaragonite 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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A cultured pearl is a pearl created by an oyster farmer under controlled conditions.Cultured pearls can be farmed using two very different groups of bivalve mollusk: the freshwater river mussels, and the saltwater pearl oysters.
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South Sea pearls are the color of their host Pinctada maxima oyster – and can bewhite, silver, pink, gold, cream, and any combination of these basic colors, including overtones of the various colors of the rainbow displayed in the pearl nacre of the oyster shell itself.
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Production. Majorica pearls are not formed in mollusks, but are man-made on solid glass balls coated with layers of pigmented and protective lacquers. They begin from high density dull glass with a specific weight, similar to that of real pearls.
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A cultured pearl is a pearl created by an oyster farmer under controlled conditions. Cultured pearls can be farmed using two very different groups of bivalve mollusk: the freshwater river mussels, and the saltwater pearl oysters.
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A Japanese word also meaning "poppy" (ケシ, 芥子), it is used in Japanese for allpearls that grew without a nucleus. Originally, keshi pearls referred to those pearlsformed 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.
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A necklace is an article of jewelry that is worn around the neck. Necklaces may have been one of the earliest types of adornment worn by humans. ... The main component of a necklace is the band, chain, or cord that wraps around the neck. These are most often rendered in precious metals such as gold, silver, and platinum.
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It comes in the form of a loose-hanging piece of jewellery, generally attached by a small loop to a necklace, which may be known as a "pendant necklace". A pendantearring is an earring with a piece hanging down.
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1884
"The Necklace" or "The Diamond Necklace" (French: La Parure) is an 1884 short story by French writer Guy de Maupassant. It is known for its twist ending (Ironic ending), which was a hallmark of de Maupassant's style. The story was first published on 17 February 1884 in the French newspaper Le Gaulois.
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Pearl necklace often refers to: Pearls in jewelry, a necklace made of pearls.
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