Exquisite Australian Black Opal Halo Diamond Necklace 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 Black Opal, 1.63 ct 14 Diamonds: 0.269 ct Opal Body Tone: N2 Opal Brightness: B4-B3 Metal Color: Golden Opal Color: Rainbow Colors Pendant Size: 17 x 10 mm (include hook/bail) Opal Size: 13.5 x 8 mm Chain: Solid 18K Yellow Gold, 18 inches. Occasion: Birthday/Anniversary