Try holding the pearls in your hand for a minute. Real pearls will feel cold initially, then will warm. Real pearls can be either natural or cultured. Natural pearls are formed when a mollusk secretes a substance called nacre to coat an irritant that makes its way inside the animal's shell. Cultured pearls are formed with a little human help -- an irritant is purposely introduced into the shell of the animal. You usually need an x-ray or an expert to distinguish between natural and cultured pearls.
Pearls differ from other gemstones in that they're not mined from rock, but rather harvested from mollusks, especially oysters. Clams and mussels have been known to produce pearls as well. Basically, a pearl is produced when an irritant such as sand gets caught inside the oyster. To protect itself, the oyster secretes a substance akin to mucus. This substance builds up around the sand and hardens. The end result is a pearl.
Natural or South Sea pearls are those made by mollusks harvested from the ocean. Every now and then, one of the pearls will be a darker shade, either gray or black. These are rare, and as a result, very expensive.
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