Cultured pearl Cultured pearl A cultured pearl is a pearl created by an oyster farmer under controlled conditions. Cultured pearls can be farmed using two very different groups of bivalve mollusk: the freshwater river mussels, and the saltwater pearl oysters. A pearl is formed when the mantle tissue is injured by a parasite, an attack of a fish or another event that damages the external fragile rim of the shell of a mollusk shell bivalve or gastropod. In response, the mantle tissue of the mollusk secretes nacre into the pearl sac, a cyst that forms during the healing process. Chemically speaking, this
The Qing Ding Pearl The Qing Ding Pearl The Qing Ding Pearl (《慶頂珠》, simplified 庆顶珠) is a Chinese play. It dates to the Song Dynasty and is still performed in adapted forms in the Beijing Opera. The play is known by other titles: Two sections (折 zhe) of the main play are sometimes performed separately as The Fisherman's Revenge《漁夫恨》 or A Fisherman Kills a Family (《打漁殺家》, simplified 打渔杀家 dayu sha jia) also Collecting the Fishing Tax (《討漁稅》 "taoyushui"). The play tells the story of Xiao En (whose real identity is Ruan Xiaoqi from "Water Margin"), a poor fisherman and his daughter who seeks bloody