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Cultured freshwater pearls are pearls which can be farmed and created using freshwater mussels. These pearls are produced in Japan as well as the united States on a limited scale but are now almost exclusively created 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 picking 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 to your technician who performs the operation. Unlike saltwater bead nucleation this method is not considered difficult and technicians need only minimum training to perform the operation. The technician creates small incisions on the upper valve and inserts the tissue piece. A small twist of the tissue upon insertion is assumed to create a higher ratio of round pearls. After the most variety of grafts are actually performed the mussel is flipped and also the procedure is completed again on the opposite valve with 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 an increased volume of low-quality pearls that located be known as Rice Krispie pearls within the 1970s and 1980s. More than the usual decade ago the freshwater pearl industry of China shifted production from the cockscomb pearl mussel to the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve for a total output of 24 to 32 pearls but produced pearls of better quality.
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