The Hades classic 9mm beveled edge faceted engagement rings in polished black tungsten carbide. Forever Metals tungsten rings are manufactured in the Unites States.
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.
Hades black faceted tungsten rings are also found in Mens Gold Rings.