Geometric Triangle Australian Boulder Opal Stud Earrings 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,  Australian Boulder Opal, 1.83 ct Play-of-Color: Red, Blue, Green. Earring Size: 10x6.5 mm Style: Stud, Push Back Occasion: Engagement/Anniversary ----------------------------------------------------------------------------------------------