This unique Cobalt 8mm comfort-fit satin-finished band This unique Cobalt 8mm comfort-fit satin-finished band features a high polished center trim and rounded edges. 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 Titanium or Gold. If interested, please call for pricing.