Unique and beautiful Australian Boulder Opal Rocks and Doublets bezel-set in silver enclosures make this necklace a truly special one. The bold necklace features prized boulder stones that define your style with their regal appeal. Size 18 offers a generous length to the necklace set with heavy stones. It comes with a 1-inch extender that offers a versatile fit to all. Sterling Silver lends a classy look to the stones that pack an impressive gem weight of 395.750 Carat.