cultured pearl have different Shapes and Types:
@_@ round pearl: Round pearls are rarely perfect spheres unless they are of gem quality or imitation. The longer the pearl remains within the oyster or mussel, the more chance there is of it developing a different shape. Contrary to the images portrayed in films very large round pearls are uncommon - and very expensive. Even seawater pearls, which have a round shell bead as their nucleus, have a hard time keeping their shape as they grow. Increasing the size of bead increases the mortality rate of the oyster. Many of the largest, most beautiful pearls come from the South Seas.
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