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Cultured freshwater pearls are pearls which can be farmed and created using freshwater mussels. These pearls are made in Japan as well as the United States Of America on a limited scale but are actually almost exclusively produced in China. The U.S. federal Trade Commission requires that farmed freshwater pearls be referred to as freshwater cultured pearls in commerce.The grafting process begins by selecting a suitable donor mussel and cutting a strip of tissue in the mantle. This strip of tissue is then cut into three-millimetre squares. These squares are delivered to some technician who performs the operation. Unlike saltwater bead nucleation this procedure isn't considered difficult and technicians only need minimum training to execute the operation. The technician creates small incisions for the upper valve and inserts the tissue piece. A small twist with the tissue upon insertion is believed to develop a higher ratio of round pearls. After the utmost amount of grafts happen to be performed the mussel is flipped along with the procedure is conducted yet again on another valve with the shell.Chinese freshwater mussels were once grafted around 50 times per shell or 25 times per valve. This practice was common when the industry mussel was primarily the cockscomb pearl mussel (Cristaria plicata). This mussel produced a high volume of low-quality pearls that stumbled on be known as Rice Krispie pearls inside 1970s and 1980s. More compared to a decade ago the freshwater pearl industry of China shifted production from your cockscomb pearl mussel on the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve for a total production of 24 to 32 pearls but produced pearls of better quality.
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