How does a bivalve create a pearl?
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The oyster's natural reaction is to cover up that irritant to protect itself. The mantle covers the irritant with layers of the same nacre substance that is used to create the shell. This eventually forms a pearl. So a pearl is a foreign substance covered with layers of nacre.
A pearl is a reaction to an irritant within a mollusk. Pearls are formed when the mollusk secretes thousands of very thin concentric layers of nacre, a secretion of calcium carbonate (aragonite and conchyolin) in a matrix that eventually coats an irritant, either man made or natural.
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