Moissanite test

While the untrained eye may visually perceive a moissanite as similar to a diamond, it has a higher refractive index — meaning it produces more rainbow ‘fire’ than a diamond when light hits the stone’s surface. Diamond is also physically harder than moissanite, which is a 9.25 on the Mohs hardness scale compared to a diamond’s rating of 10.

While they both feature dispersion, scintillation, and are both considered to be good thermal conductors, moissanites and diamonds are otherwise distinct.