These coin pearls are not perfectly round. They do have that wonderful natural baroque shape to them. These coin pearl beads have a luster that is sensational! Love these and you will too! Nice value here. Freshwater coin pearl beads are created when a small flat disc shaped shell, instead of a round bead, is inserted into the oyster or more commonly these days, mussel. Most of these pearls are farmed in rivers, lakes or streams. The result is a a fabulous flat disc shape pearl. Our freshwater coin pearl beads are picked by their luster and size.