Moissanite is a lab-grown gemstone which was first discovered over 100 years ago on a meteor that struck earth. Its high refractive index and light dispersion produce brilliance and fire not seen in other gems. Its incredible durability ranks second only to diamond -- even higher than sapphire or ruby. Moissanite's sparkle, durability, and ethical lab-creation make this stone the perfect engagement ring choice. Of all the white gemstone alternatives, Moissanite looks and behaves the most like diamond. The Forever One™ moissanite from Charles & Colvard grades at purely colorless.