Moissanite is a white silicone-carbide-based stone that is commonly associated with the synthetic variation that has now become a popular substitute for the diamond. Moissanite may be visibly similar to a natural diamond but, chemically, it is very different. Diamonds come from carbon and moissanite comes from silicon carbide. Moissanite is one of the hardest known substances, ranking just below diamond on the Mohs Scale. Due to its toughness, it’s the perfect stone to cut all other materials (except diamonds).