A moissanite ring looks and feels like the real deal and most people won't realise you're not wearing a diamond. But there are some big differences. A diamond is mined from the earth and made of a solid form of pure carbon. Moissanite is a silicon carbide mineral and one of the rarest crystals on earth. Discovered in a fallen meteor, it is even rarer than a diamond. Since moissanite is so scarce to find, it's now created in a laboratory using cutting-edge heat and pressure technology that mimics the way the gemstone occurs naturally. Another difference is colour. A natural diamond has single refraction which reflects bright, white and clear light. Moissanite has double refraction, and although virtually colourless, its slight hints of yellow and green give it an amazing rainbow-like brilliance. Moissanite is almost indistinguishable from diamond as far as the naked eye is concerned, making it an extremely appealing option for a stunning engagement ring.