Mother of Pearl Natural Pi Circle Round Beads | 18x4mm | Black | 4 Beads |Black Mother of Pearl Natural Pi Round Beads, perfect for your jewelry making projects! These exquisite beads are made from genuine black mother of pearl, also known as "nacre," which forms on the inner shell layer of certain mollusks. The black mother of pearl beads showcase a stunning black grey background with a pearlescent effect that covers the entire surface. They also exhibit beautiful violet to green iridescence, especially around the lip of