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 (given name) the United States in the 1990 census. Authors Pamela Redmond Satran and Linda Rosenkrantz noted in their 2007 book "The Baby Name Bible" that Pearl is in fashion again with hipster parents in the United States. Pearl can also be a surname, one which is common among Jews. Zane Grey, the male American writer of Westerns, was born Pearl Zane Grey. Pearl Buck was a well-known female American author. Minnie Pearl was a country and western comedian and singer. The Poor Pitiful Pearl doll was a vintage doll manufactured by the Brookglad Corp., Gladtoy Company and later by the Horsman