How on Earth does an oyster make a pearl?

Answer 1

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a peice of sand gets inside the oyster and it starts to cover it with an enamel to prevent it from irritating the fragile insides, over several years time the enanmel is built up enough to have made a pearl

Answer 2

According to Webster's New World dictionary:

a pearl is an abnormal nacreous (iridescent; lustrous) growth of various, usually roundish, shapes, formed around an irritation such as a grain of sand, a parasite, or other foreign body withi the shell of some oysters and certain other mollusks

Answer 3

sand, water, heat and pressure.