Moissanite sparkles like crazy! A gemstone in its own right, moissanite is made of silicon carbide, whereas diamonds (both lab-grown and mined) are composed of carbon. Their distinct composition means that each type of gemstone has its own unique properties and sparkle. That said, the nuances may be hard to perceive to the untrained eye. For example, moissanite engagement rings are known for their color flash, especially in direct sunlight. The facets of a moissanite actually refract more color than those of a diamond.