Cobalt boasts a beautiful, Platinum-like color which goes throughout the ring. Cobalt rings will not chip or crack, making it great for diamonds and custom work. Cobalt rings are malleable up to a half-size; however, we recommend sending it to us for a free resize. Cobalt is a light-weight and hypoallergenic. In case of an emergency, cobalt rings can be removed with a diamond-tip ring cutter. Cobalt is often used in the medical field.