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
Cora Pearl In his biography of Pearl, "The Pearl From Plymouth" (1950), author W. H. Holden writes that there is evidence that Pearl regularly sent money to both her mother in England and father in America. For Cora Pearl, money was for spending, for accumulating the luxuries of life and buying her way to a coveted perch in the upper echelons of society. Her jewel collection alone was valued at some one million francs; at one point, she owned three homes, and her clothing was made for her by the renowned couturier Charles Frederick Worth. As her career prospered, the gifts from