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 of the Orient Tower Pearl of the Orient Tower The Pearl of the Orient Tower, previously known as Embassy Pointe Tower, is a residential skyscraper located in Manila, Philippines, owned by the Philippine Estates Corporation. Standing at , it is one of the tallest buildings in the City of Manila. The building has 42 floors above ground, wherein 6 floors are for parking spaces, 5 floors for office and commercial purposes, 30 floors for luxury residential units, and 2 floors for penthouse units. There are also 4 basement levels for parking. The Pearl of the Orient Tower was designed by American architectural firm Nadel