A pearl is a hard object produced within the soft tissue specifically the mantle of a living sheelled molluse. Just like the shell of a clam, a pearl is made up 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. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries, and because of this, the word pearl has become a metaphor for something very rare, fine, admirable, and valuable.
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