The size of these freshwater coin pearl beads is 13-14mm. These are a very nice value! Great size and color. These coin pearls have a nice nacra with a few lumps. Great luster. You will like these beads at this price. 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.