Black ceramic is a beautiful material. The material is very hard and doesn't scratch easily. It provides a lustrous background for any inlay.
Ceramic is a brittle material that can crack if it experiences a sudden impact or is stressed (as with an expanding ring mandrel). To prevent this, we recommend using two layers of electrical tape wrapped around the mandrel instead of over-tightening. If the ring still slips, use two dabs of CA glue to glue it to the mandrel rather than over-tightening the ring on the mandrel.
Rings are available in standard 8mm or thinner styles of 6mm and 4mm. (Our 4mm size 7 is out of stock until about 9/30/20.)
Note: ring blanks may have the size and/or material type laser-engraved on the interior.