Elegant Australian Opal Ring in 14K Gold: This 13x9mm Doublet Opal Ring, Size O, is classified as Natural Opal Type 3. It features Genuine Australian Gem Crystal Opal, backed by Australian Black Opal potch or Boulder Opal Potch. Lifetime guarantee, no artificial color, and international warranty. Personalize your opal upon request. Please note opals' unique play of color may vary from online images.