Hammered Finish 18K Yellow Gold Black Opal and Diamond Engagement Wedding Ring Promise Ring. Design Idea: I discovered this stunning red Lightning Ridge black opal years ago, and now I've crafted it into this exquisite design. The hammered finish on the ring band adds a unique texture. 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 Solid 18K Yellow Gold Austalian Black Opal: 0.131 ct 8 Diamond: 0.017 ct Opal Body Tone: N3 Opal Brightness: B4 Opal Size: 5 x 3 mm Ring Size: 7 Play-of-Color: Red, Orange, Green, Yellow Occasion: Engagement/Anniversary