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" ... Don O’Connell: Moissanite is made of silicon carbide and diamonds are made of carbon. Silicon carbide is a rare mineral found in the earth, but it’s so rare that it is hard to find a piece in the ground large enough to cut into a one carat gemstone. Moissanite is second only to diamond in hardness. On the Mohs hardness scale, diamond is a 10 and moissanite is a close 9.25-9.5. Though they are both white gems, the optical properties of moissanite and diamonds are different. Moissanite has more fire and brilliance than diamond, meaning that more light is reflected out of a moissanite gemstone. This is called double refraction. Moissanite also has more of a rainbow effect, or fire, than a diamond. ... "
" ... Left: Pure magnesium. Right: A new magnesium/silicon carbide composite. (Credit: UCLA Scifacturing... [+] Laboratory) ... "