Cultured freshwater pearls are produced my mussels and are commonly found in lakes and rivers in China. Originally, freshwater pearls were found to be more irregular in shape and less lustrous, however, due to advances in technology, the quality of freshwater pearls has improved remarkably in their range in color, shape, luster, and quality. Today's freshwater pearls are sometimes likened to Akoya pearls, which are expensive saltwater pearls. Freshwater pearls come in various shapes, sizes, and colors. The most common colors are whites and pastel shades of pink, champagne, orange, and gray.