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 Pearls, unlike gemstones or precious metals, are grown by live creature. A natural pearl forms when an irritant, such as parasite or a piece of sand, accidentally enters the body of a particular species of oyster, mussel, or clam and cannot be expelled. As a defense mechanism, the mollusk secretes a smooth, crystalline fluid, called "nacre"(the same secretion it uses for shell-building, composed mainly of carbonated calcium), to coat the intruder. As long as the irritant is present, the mollusk continues to add a layer of nacre upon a lay of nacre on the irritant until a lustrous pearl is formed
 Pearls, unlike gemstones or precious metals, are grown by live creature. A natural pearl forms when an irritant, such as parasite or a piece of sand, accidentally enters the body of a particular species of oyster, mussel, or clam and cannot be expelled. As a defense mechanism, the mollusk secretes a smooth, crystalline fluid, called "nacre"(the same secretion it uses for shell-building, composed mainly of carbonated calcium), to coat the intruder. As long as the irritant is present, the mollusk continues to add a layer of nacre upon a lay of nacre on the irritant until a lustrous pearl is formed

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