Sterling Silver, 22K gold, Australian Boulder Opal. This pretty opal is almost like looking deep into the ocean and sits beside a faceted peridot. It measures 1-1/8" across the top of the ring. (PLEASE SEE THE VIDEO THAT SHOWS HOW TO PUT IT ON AND GIVES A SENSE OF THE SCALE) The rustic shank was made by heating the surface of the silver and carving into it with a stylus. The shank is "U" shaped that allows for sizes 7-1/2 to 8-1/2 closed up but will accommodate a larger size as it is open (not soldered) in between the silver part and the stone. EXCHANGES ACCEPTED WITHIN 10 DAYS OF RECEIPT.