This unique Cobalt 10mm comfort-fit satin-finished band features high polished horizontal grooves and a high polished beveled edge. Cobalt is 4x harder than Platinum, 5x harder than Gold and 7x harder than Silver. It is hypoallegenic, scratch resistant and shatter proof. This ring is also available in Palladium, Platinum or Gold. If interested in Palladium, Platinum or Gold, please call for pricing.