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A natural pearl, which is rather rare, can form over a wide range of time periods, ranging from years to decades. Cultured pearls, which are simply man-made spheres implanted into the appropriate species of shellfish and covered with thin layers of nacre, take a much shorter time, and are harvested after one to five years.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoPearls are formed within or beneath the mantle of various mollusks by deposition of thin concentric layers of nacre around a foreign object.
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