This opal beaded bolo bracelet is framed in sterling silver with a platinum coating. Round opal beads are woven in a semi-circular loop with two silver-colored beads at each end. This opal beaded bracelet has a bolo clasp that helps you adjust the bracelet according to your wrist size. Opals are known as the national gemstone of Australia, and they weigh nine on Moh's scale of hardness.