The size of these beautiful freshwater coin pearl beads is14mm avg. diameter. 8mm avg. thickness. Looking for a freshwater coin pearl? These are the ones! Beautiful, lustrous, creamy white coin pearls. Each coin pearl bead is natural in shape, no two exactly alike. These freshwater coin pearls are the bomb! Seriously, great value for this sort of quality coin pearl. 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.