Quality Factors of Chinese Freshwater Cultured Pearls The tremendous popularity of Chinese freshwater cultured pearls is due to the variety of shapes and colours, which cover the whole range from high-class jewelry to average necklaces. However, the variety makes it impossible to establish a general grading or evaluation system. Size: The size of Chinese freshwater pearls range from 2mm to 15mm. Among 8-9mm pearls, there is only about 0.01% of production for… Continue reading