This 4mm black tungsten carbide ring features a stunning galaxy opal inlay and a durable, mirror-like finish. Tungsten is much harder than gold, steel, and titanium, making it highly resistant to scratches—only diamonds can scratch it. The ring has a flat design with hammered edges, black IP plating, and a comfort fit. Made from jewelry-grade tungsten carbide, it's hypoallergenic and cobalt-free. Available in sizes 5-10, including half sizes. Comes with a complimentary ring box