The size of these freshwater coin pearl beads is 14 - 14.5mm. These peachy Pink coin pearls have luster luster luster!!!!! Very nice quality. Thick nacra! 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.