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.
Tungsten carbide is extremely hard, ranking about 9 on Mohs scale, and with a Vickers number of around 2600. It has a Young's modulus of approximately 530â700 GPa, a bulk modulus of 630â655 GPa, and a shear modulus of 274 GPa.