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Cultured freshwater pearls are pearls which are farmed and created using freshwater mussels. These pearls are made in Japan and also the United States Of America over a limited scale but have become almost exclusively created in China. The U.S. Ftc requires that farmed freshwater pearls be called 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 a technician who performs the operation. Unlike saltwater bead nucleation this technique is not considered difficult and technicians only need minimum training to do the operation. The technician creates small incisions for the upper valve and inserts the tissue piece. A small twist of the tissue upon insertion is considered to create a higher ratio of round pearls. After the maximum number of grafts happen to be performed the mussel is flipped as well as the procedure is performed once again on one other valve from the shell.Chinese freshwater mussels were once grafted as much as 50 times per shell or 25 times per valve. This practice was common if the industry mussel was primarily the cockscomb pearl mussel (Cristaria plicata). This mussel produced a high volume of low-quality pearls that came to be referred to as Rice Krispie pearls in the 1970s and 1980s. More compared to a decade ago the freshwater pearl industry of China shifted production through the cockscomb pearl mussel towards the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve to get a total output of 24 to 32 pearls but produced pearls of better quality.
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