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
The Pearl (novel) The Pearl (novel) The Pearl is a novella by American author John Steinbeck, first published in 1947. This story is about a poor family which is more likely described as native Americans, who discovers an enormous and valuable pearl. The novella explores man's nature as well as greed, defiance of societal norms, and evil. Steinbeck's inspiration was a Mexican Folk Tale from La Paz, Baja California Sur, Mexico, which he had heard in a visit to the formerly pearl-rich region in 1940. In 1947, it was adapted into a Mexican film named "La perla" and in 1987 into a cult