Two main parts of the intervertebral discs are the outer ring (annulus fibrosus) and the inner gelatinous material. (nucleus pulposus). The outer ring consists of fibrocartilage, while the inner material shows many similarities to the articular hyaline cartilage both in its biochemical and histological appearance.
For this reason, Everything Wedding Rings recommends avoiding black tungsten wedding bands-with one exception. Titanium Kay has recently launched a new tungsten carbide wedding ring design with solid black inlay that is 100% scratch proof. So, if you are looking for a tungsten ring with black inlay features I highly recommend one of the Titanium Kay 2nd Generation rings.
Answer Wiki. The term tungsten carbide technically refers to a stoichiometric compound of tungsten, W, and carbon, C as you can see in the phase diagram attached. The compound is an interstitial compound with a mixed bond: metallic, ionic and covalent. The most important characteristic of WC is its toughness which is superior to any other equally hard material.