Cultured pearl is calcium carbonate and a fibrous protein called conchiolin. As the nacre builds up in layers of minute aragonite tablets, it fills the growing pearl sac and eventually forms a pearl. Natural pearls are formed by nature, more or less by chance. On the other hand, cultured pearls are human creations formed by inserting a tissue graft from a donor oyster, upon which a pearl sac forms, and the inner side precipitates calcium carbonate, in the form of nacre or "mother-of-pearl". The most popular and effective method for creating cultured pearls are made from the shells of freshwater river mussels
Pearl of Kuwait Pearl of Kuwait The Pearl of Kuwait is a pearl that was bought in 2004 by its current owners, Bond Street, London jewellers Symbolic & Chase, and named the "Pearl of Kuwait" in recognition of the Persian Gulf waters in which many pearls have been found. It measures 258.12 grains (64.5 carats, 69.8 carats with its diamond cap) making it the third-largest (documented) well-formed natural pearl drop. In 2004, a large pearl named the Pearl of Kuwait was consigned by an undisclosed private family for auction at Christie's in London. The Pearl of Kuwait was part of the Pearls exhibition