Beautiful Play of Color Australian Boulder Opal Diamond Halo Engagement Ring 18K Yellow Gold. Free Domestic USPS First Class Shipping!  Free One Year Limited Warranty!  Free Gift Bag or Box with every order! Opal—the queen of gemstones, is one of the most beautiful and rarest gemstones on earth.  Every piece of opals has its colors and patterns, which is perfect for designers to create unique engagement rings for someone extra special.  Our jewelry uses 100% Natural & Ethical opal stones (NO synthetics or imitations). --------------------------------------------------------------- ABOUT THIS PRODUCT 18K Yellow Gold Australian Boulder Opal, 0.44 ct 12 White Diamonds: 0.234 ct Opal Brightness: B4-B3 Ring Size: 7 Opal Color: Reflects Red, Yellow, and Blue Colors. Occasion: Engagement/Anniversary