Kana Black Tungsten Relationship Ring for Couples 9mm Beveled Silver.
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.
Kana silver beveled edges black tungsten rings also found in 10mm Kana silver edges black tungsten rings.