This stunning quartz mermaid glass necklace is delicately made with specialty glass beads, metal-coated quartz crystal beads (aka mermaid glass). The center crystal is a Swarovski crystal with an Aurora borealis finish. The clasp is sterling silver, metal stamped 925. Necklace length: roughly 18” Necklace material: Strong Micro Nylon Cord, metal-coated quartz, specialty glass beads. Clasp: Sterling Silver 925 Center Crystal: Swarovski Metal-coated crystals are natural crystals, such as quartz, whose surface has been coated with metal to give them an iridescent metallic sheen.