Australian Boulder Opal is bezel set for this mixed metal necklace. Hanging on heavy sterling oxidized chain with gold-fil hook clasp, this favorite necklace style is a great way to showcase this beautiful opal. Swirling blues and greens with a pocket of green sparkle, this stone encapsulates the magic in a tropical greenhouse! Stone is 21mm x 15mm at widest and hangs on 18" chain.