Tuesday, February 26, 2019

What is Pearl Rating System?

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 (/ˈneɪkər/ NAY-kər also /ˈnækrə/ NAK-rə), 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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The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name snail is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract completely into.
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The nucleus bead in a beaded cultured pearl is generally a polished sphere madefrom freshwater mussel shell. Along with a small piece of mantle tissue from another mollusk (donor shell) to serve as a catalyst for the pearl sac, it is surgically implanted into the gonad (reproductive organ) of a saltwater mollusk.
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