What does bead-nucleated mean?

Bead-nucleated pearls are grown by inserting a small rounded bead into the body of a marine pearl oyster or into an existing pearl sac of a freshwater mussel. Nacre will form around the bead creating a pearl. Except in the case of keshi pearls, all Akoya, South Sea and Tahitian pearls are bead-nucleated. Only some freshwater pearls are bead nucleated.

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