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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 Usa with a limited scale but are actually almost exclusively produced in China. The U.S. federal Trade Commission requires that farmed freshwater pearls be known as freshwater cultured pearls in commerce.The grafting process begins by selecting a suitable donor mussel and cutting a strip of tissue from the mantle. This strip of tissue is then cut into three-millimetre squares. These squares are delivered with a technician who performs the operation. Unlike saltwater bead nucleation this technique is not considered difficult and technicians only need minimum training to perform 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 variety of grafts happen to be performed the mussel is flipped and the procedure is completed once again on another valve in the shell.Chinese freshwater mussels were once grafted up to 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 higher volume of low-quality pearls that stumbled on be called Rice Krispie pearls inside 1970s and 1980s. More than the usual decade ago the freshwater pearl industry of China shifted production from the cockscomb pearl mussel for the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve to get a total production of 24 to 32 pearls but produced pearls of better quality.
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