Peacock Coin Freshwater Pearls exhibit beautiful excellent luster, 4mm depth, peacock of a strong purple & blue hue, thick nacre, very symmetrical coin shape, & fairly consistent quality on strand. Standard .08mm drill hole size. We recommend the use of 28 gauge wire, .015 stringing wire, #0 or #1 Silk Poly Cording and Extra Fine Flex Needle with these beads.