how is pearl formed inside the oyster?
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There are essentially three types of pearls: natural, cultured and imitation.
Natural Pearls form when an irritant - usually a parasite and not the proverbial grain of sand - works its way into an oyster, mussel, or clam. As a defense mechanism, a fluid is used to coat the irritant. Layer upon layer of this coating, called 'nacre', is deposited until a lustrous pearl is formed.
A cultured pearl undergoes the same process. The only difference is that the irritant is a surgically implanted bead or piece of shell called Mother of Pearl. These 'seeds' or 'nuclei' are most often formed from mussel shells. Quality cultured pearls require a sufficient amount of time - generally at least 3 years - for a thick layer of nacre to be deposited, resulting in a beautiful, gem-quality pearl. Lower-quality pearls have often been 'rushed' out of the oyster too quickly (sometimes a year or less) and have a too-thin coat of nacre.
Natural Pearls form when an irritant - usually a parasite and not the proverbial grain of sand - works its way into an oyster, mussel, or clam. As a defense mechanism, a fluid is used to coat the irritant. Layer upon layer of this coating, called 'nacre', is deposited until a lustrous pearl is formed.
A cultured pearl undergoes the same process. The only difference is that the irritant is a surgically implanted bead or piece of shell called Mother of Pearl. These 'seeds' or 'nuclei' are most often formed from mussel shells. Quality cultured pearls require a sufficient amount of time - generally at least 3 years - for a thick layer of nacre to be deposited, resulting in a beautiful, gem-quality pearl. Lower-quality pearls have often been 'rushed' out of the oyster too quickly (sometimes a year or less) and have a too-thin coat of nacre.
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The formation of a natural pearl begins when a foreign substance slips into the oyster between the mantle and the shell, which irritates the mantle. It's kind of like the oyster getting a splinter. The oyster's natural reaction is to cover up that irritant to protect itself.
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