Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids.
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