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Cultured freshwater pearls are pearls which can be farmed and created using freshwater mussels. These pearls are produced in Japan and the Usa with a limited scale but are actually almost exclusively manufactured in China. The U.S. Ftc requires that farmed freshwater pearls be called freshwater cultured pearls in commerce.The grafting process begins by choosing a suitable donor mussel and cutting a strip of tissue from your 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 just 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 from the tissue upon insertion is considered to produce a higher ratio of round pearls. After the maximum quantity of grafts happen to be performed the mussel is flipped as well as the procedure is completed again on the other valve with the shell.Chinese freshwater mussels were once grafted approximately 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 an increased volume of low-quality pearls that located be known as Rice Krispie pearls in the 1970s and 1980s. More than 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 any total output of 24 to 32 pearls but produced pearls of better quality.
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