Pearls
Pearls have an amazing long history, that is rich is culture. In fact they are one of the most ancient documented gems. Records of commercial harvesting have been found going back over 2500 years ago.
The natural occurrence of pearls is actually quite rare with only one in several million shellfish ever producing a pearl. Oysters are the best known source of pearls but abalone, clams, and muscles also produce pearls. This is one of the reasons that pearls are harvested. Harvested pearls are known as cultured pearls, or manmade pearls.
In order for a pearl to form an irritant has to
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