A Gorgeous Antique Australian Black Opal Ring Vintage Art Deco, circa 1950. This beautiful estate ring holds a colorful Australian black opal triplet gemstone that shows beautiful colors in the light. The opal measures about 12mm x 18mm oval. The setting is composed of sterling silver with beautiful detailing. Overall the ring measures about 3/4 inch long by about 13/16 inch wide from side to side. Ring Size: about 7 (could be resized by your jeweler or ask me about using mine before shipping. This ring was acquired through an estate collection and is in lovely vintage condition.