A Stunning Vintage Black Opal Ring in a Retro Deco Design From the Fine Estate Jewelry. The center of this vintage ring holds a striking black opal triplet gemstone with the most beautiful deep blue background with flashes of peacock green. The opal measures about 6 x 9mm oval. The setting is made of vintage sterling silver and styled in a wonderful retro deco style with fantastic details. Overall the ring measures about 9/16 inch long by about 3/4 inch wide from side to side. Ring Size: about 5 (could be resized by your jeweler or ask me about using mine before shipping). From an estate collection in lovely vintage condition.