Thursday, March 15, 2007

Cultured Pearls

Natural pearls are those pearls which are formed in nature, more or less by chance, by a parasite or a piece of food lodging itself in the gonad or mantle tissue of a host oyster. Cultured pearls, by contrast, are those in which humans give a helping hand. By actually inserting a foreign object into the tissue of an oyster or mollusk, pearl farmers can induce the creation of a pearl. The same natural process of pearl creation takes place. The only difference is that in the one case, the process was begun accidentally; while in the other case, it was begun intentionally.

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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