Pearl is a hard and roundest object produced within the soft tissue of a living shelled mollusk. Just like the shell of mollusks, a pearl is composed of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes of pearls occur. Freshwater and saltwater pearls may sometimes look quite similar, but they come from very different sources. Natural pearls are very rare ...
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