When freshwater pearls reach a size of 8.0 to 9.0 mm, they are considered large. The most popular length for a necklace of this size is 16 inches, but they are also perfectly suited for a long strand or a rope. Freshwater pearls differ from saltwater pearls in the way that they are produced. Saltwater pearls are produced by inserting a bead into a pearl oyster. Freshwater pearls have no bead. They are solid pearl. The freshwater pearls we offer are the roundest, highest-grade pearls on the market today.