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In three to seven years, the oyster can produce a perfect pearl.

These pearls are not as valuable as natural pearls, but look exactly the same.

Examples include: Because of its good flavor, it commands high prices.

Almost all shell-bearing mollusks can secrete pearls, yet most are not very valuable.The hard surfaces of oyster shells and the nooks between the shells provide places where a host of small animals can live.Hundreds of animals, such as sea anemones, barnacles, and hooked mussels, inhabit oyster reefs.Their nervous system includes two pairs of nerve cords and three pairs of ganglia.While some oysters have two sexes (European oyster and Olympia oyster), their reproductive organs contain both eggs and sperm.