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 Harbor and the Explosions Pearl Harbor and the Explosions Pearl Harbor and the Explosions was a musical act from San Francisco, California. Forming in 1978, the new wave band had limited success in the late 1970s and early 1980s, with their debut single, "Drivin'", reaching the lower end of the American top 40 charts in 1980. That same year, they released a self-titled LP which included the song "Shut Up and Dance", which received considerable airplay, particularly in the Bay Area. The vocalist, Pearl E. Gates (also known as "Pearl Harbor", and later "Pearl Harbour" (British and Canadian spelling), would eventually marry Clash bassist