Adorable Australian Black Opal Halo Diamond 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.  We use 100% Natural & Ethical opal stones (NO synthetics or imitations) for our jewelry. --------------------------------------------------------------- ABOUT THIS PRODUCT 18K Yellow Gold Australian Black Opal, 0.23 ct Diamonds: 0.244 ct Opal Size: 5x4 mm Ring Size: 7 Opal Color: Beautiful Play of Color Occasion: Engagement/Anniversary