Exquisite Mexican Fire Opal Halo 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 Solid 18K Yellow Gold Mexican Fire Opal: 0.98 ct Opal Size: 8 x 5.5 mm 30 Diamonds: 0.295 ct Ring Size: 7 Play-of-Color: Beautiful Rainbow Colors. Occasion: Engagement/Anniversary