Moissanite is the most brilliant jewel in the world. It has more brilliance, fire and lustre than any other gemstone.Moissanite is a naturally occurring mineral, silicon carbide, that is found in limited quantities in the earth. While moissanite exists in nature, it is so incredibly rare that it must be created in a lab to produce pieces large enough to cut into gemstones. When cut and faceted, moissanite is by definition, the world’s most brilliant gem.