About Pearls | Types of Pearls | American Gem Society - American ...
Pearls, natural or cultured, are formed when a mollusk produces layers of nacre (
pronounced NAY-kur) around some type of irritant inside its shell. In natural ...
Pearl - Wikipedia
A pearl is a hard, glistening object produced within the soft tissue (specifically the
mantle) of a ... The finest quality of natural pearls have been highly valued as
gemstones and objects of beauty for many centuries. ... but the quality of their
iridescence is usually very poor and is easily distinguished from that of genuinepearls.
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