Certificated 2.26ct Play of Color Australian Black Opal Diamond Halo 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 Black Opal, 2.26 ct 28 Diamonds: 0.488 ct Opal Body Tone: N5 Opal Brightness: B4 Bright Opal Color: Beautiful Red and Blue Rainbow colors. Opal Size: 11 x 7.5 mm Ring Size: 7 Occasion: Engagement / Wedding Guild Gemstone Certification