Pearls are formed by oysters both naturally and through human assistance. In natural formation, foreign matters enters the mollusk and it covers the matter with layers of nacre (mother of pearl – a material produced by mollusks) around it to releave any irritation caused. The foreign matter can be organic or inorganic, ranging from sand to decaying plants. In cultured, aka human assisted, pearl formation, humans place specific matter into the mollusk. Saltwater cultured pearls have a bead nuclues and mantle tissue placed into it (bead nucleation), and freshwater cultured pearls involve only mantle tissue being added (tissue nucleation). Once the foreign material is added, the mollusks go onto form pearls.
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