Moissanite is popular as an affordable alternative to diamond. While slightly less hard, it has grown in popularity since its discovery over 120 years ago.
Moissanite is often faceted because of its brilliance and has a harness rating of 9.25 out of 10. This makes moissanite slightly less hard then a diamond and a brilliant option for you class ring.
USNA Class Ring Mod with Moissanite Centerpiece and Diamond Dividers