Contrary to the popular credence that pearls are perfectly round shiny objects, not all pearls, are so well shaped. Some pearls are formed in an uneven shape, owing to the shape of the irritant embedded between the mantle and the shell. These pearls are known as the baroque pearls. Pearls come in different colors, and can be found all over the Earth. Black pearls, which are very rare in wild nature, are only found in South Pacific. Though all kinds of oysters create pearls, those created by some varieties are unattractive and with low commercial value and hence, are not used to make pearl jewelry.
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