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 unseen in other gems. It is a very durable mineral, ranking only below diamond, and even above ruby and sapphire. Moissanite's sparkle, durability, and ethical creation make it the perfect engagement ring choice. Of all the white gemstone alternatives, moissanite looks and behaves the most like diamond.