Fine opal ring featuring a 12c approximate weight Australian square shaped gray crystal opal with green, blue and orangish red play of color mounted in an 18k gold mounting full of baguette, marquise and pear shaped diamonds. US size 7 Pear Shaped Diamond Ring, Opal Diamond Ring, Diamond Gold Ring, Jewelry Opal, Crystals Stones, Crystal Opal, Cabochon Ring, Vintage Cocktail, Eye Stone