These coin pearl beads are 11-12mm. A to A-grade. Grading coin pearls is a bit subjective but we have been told that these freshwater coin pearls are A to A- grade. Wonderful naturally peach colored coin pearls. Very limited! 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.