Tree Branch Design Australian Boulder Opal Diamond Engagement Ring 18K Yellow Gold. Free Domestic USPS First Class Shipping! Free Gift Bag or Box with every order! Opal—the queen of gemstones, is one of the most beautiful gemstones in the world. Every piece of opal is unique in its own ways and patterns. We only use high-quality Natural Opals (NO synthetics or imitations) for our jewelry. ---------------------------------------------------------------------------------------------------- ABOUT THIS PRODUCT 18K Yellow Gold Australian Boulder Opal, 0.56 ct 3 Diamond: 0.028 ct Opal Size: 7 x 4 mm Opal Color: Reflects Blue, Green, and Yellow Colors. Ring Size: 7 Occasion: Engagement/Anniversary