The Europa black tungsten ring is a polished black ring. The Europa is a flat shape with a rounded interior for maximum comfort. If you are looking for matching wedding bands there is many widths to choose from.
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.
Matching rings available here: Europa 7mm Black Fashion Tungsten Rings