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) pearl dealers is another character that demonstrates greed and manipulation. When Kino tries to sell the pearl, the pearl dealer refuses to take the pearl for its actual price. Instead, he says it is worth less so that he could make more money. He heightens the difference between what Kino wants from the pearl and what it actually brings. These publications praised the novel as a "major artistic triumph" and emphasizes how Steinbeck understands "the universal significance of life." This novel did not have as great of a review later on. Though many still believe that Steinbeck's work was a