Eclipse matching black tungsten promise engagement rings in 8mm width from Forever Metals. Eclipse Tungsten carbide rings comes with comfort fit and makes an ideal promise ring.
The Metal that is used is a Nickel Binder that is higher in quality in comparison to cobalt. Cobalt is a inferior binding agent which may darken the color of the ring over time. Cobalt is most common in lower cost tungsten rings. This is due to the rings being mass produced in countries other than the United States.
Also available in an Eclipse 7mm Gold Polished Tungsten Rings.