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 Mystery of the Pink Pearl The Mystery of the Pink Pearl The Mystery of the Pink Pearl ("Golapi Mukta Rahasya") is a Bengali detective story written by Satyajit Ray. Feluda is the protagonist of the story.It was first published in Sandesh (magazine), 1989. The story ranks 31st in Feluda series. In the title story, a rare pink pearl surfaces in a little Bengal village, and the owner turns to Feluda for protection against the machinations of the sleuth's old enemy, the devious Maganlal Meghraj. As the plot twists and turns, Feluda ends up in the sinister galis of Banaras, where he must outwit Maganlal once