What is Moissanite The appearance of moissanite is very similar to that of natural diamonds, which is difficult to distinguish with the naked eye. It is also a gem with the closet physical properties to natural diamonds. And it is much more affordable than real diamonds. Features of moissanite Moissanite shines brighter than any stones!! The fire color of moissanite can look so beautiful because of the physical, chemical, and optical properties of its crystals. This gem has a very high refractive index of 2.65-2.69(2.42 for diamonds), a dispersion index of 0.104( 0.044 for diamonds), and a gloss rate of 20.4( 17.2% for diamonds). Moissanite has a Mohs hardness of 9.25, which is higher than other gemstones. Its high hardness makes it not easy to be scratched and cracked and can last forever.