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Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are designed in Japan along with the Usa with a limited scale but have become 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 selecting 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 with a technician who performs the operation. Unlike saltwater bead nucleation this method isn't considered difficult and technicians need only minimum training to perform the operation. The technician creates small incisions about the upper valve and inserts the tissue piece. A small twist in the tissue upon insertion is believed to develop a higher ratio of round pearls. After the most variety of grafts are actually performed the mussel is flipped and also the procedure is conducted yet again on another valve from the shell.Chinese freshwater mussels were once grafted around 50 times per shell or 25 times per valve. This practice was common once the industry mussel was primarily the cockscomb pearl mussel (Cristaria plicata). This mussel produced a high volume of low-quality pearls that found be known 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 towards the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls accepting only 12-16 grafts per valve for a total manufacture of 24 to 32 pearls but produced pearls of better quality.
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