Round Moissanite are not real diamonds, but they have similar characteristics to real diamonds, such as a similar refractive index, similar brilliance, similar strength, and basically the same toughness, so it is easy to get confused. RD Moissanite has a brilliance of 20.4%, while real diamonds have a brilliance of 17.2%. In other words, under the same standard of light, the first one will look more lustrous, while the latter one will be relatively less lustrous, but these two are much better than blue stones, emeralds and their chrysoberyl.