1. A culture pearl is shaped by an oyster, collected of concentric layers of a crystalline substance called nacre deposited about an irritant on purpose placed in the oyster’s body.
2. Natural pearls are formed by deposits of nacre about an irritant which by chance lodges in the body of an oyster.
3. An imitation is anything else which resembles a pearl but has a surface shaped by a manufacturing process- this is an imitation or replicated pearl and must be labeled as such.
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