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Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are made in Japan and the United States Of America with a limited scale but are now 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 choosing a suitable donor mussel and cutting a strip of tissue through 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 technique is not considered difficult and technicians only need minimum training to execute the operation. The technician creates small incisions on 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 most number of grafts are actually performed the mussel is flipped as well as the procedure is completed once again on another valve in the shell.Chinese freshwater mussels were once grafted approximately 50 times per shell or 25 times per valve. This practice was common in the big event the industry mussel was primarily the cockscomb pearl mussel (Cristaria plicata). This mussel produced a top volume of low-quality pearls that located be referred to as Rice Krispie pearls within the 1970s and 1980s. More than a decade ago the freshwater pearl industry of China shifted production in the cockscomb pearl mussel on the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve for the total manufacture of 24 to 32 pearls but produced pearls of better quality.
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