http://www.blazingjewelers.com/moissanite-stone/
About Moissanite
What is Moissanite?
Moissanite is regarded as a diamond alternative, with some optical properties exceeding those of diamond. It is marketed as a lower price alternative to diamond that also claims less exploitative mining practices. Because of its hardness 9.25 mohs, it can be used in high-pressure experiments, as a replacement for diamonds.