A pearl is a hard object produced within the soft
tissue (specifically the mantle) of a living shelled mollusc. 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 (baroque 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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