Sterling Silver, 22K gold, Australian Boulder Opal.  This is a fun statement ring!  (PLEASE SEE THE VIDEO THAT SHOWS HOW TO PUT IT ON AND GIVES A SENSE OF THE SCALE)  It measures 1-1/4" across the top of the ring.  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.