How are natural and artificial pearls created?

How are natural and artificial pearls created?
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Pearls are made from small strange particles that deposit between the shell and the mantle of the oyster. These particles trigger a defense process by the organism and they are gradually covered by calcium carbonate layers secreted by the oyster thus giving birth to pearls. In the artificial production of pearls a small fragment of shell covered with mantle pieces is inserted between the shell and the mantle of an oyster and a pearl is formed around the graft. Mollusca - Image Diversity: cultured pearls
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