New beautiful 4ct moissanite pendant with a chain, light blue color ,VVS1 clarity. 10*9mm emerald cut. Sterling silver pendant, chain 18inc Very sparkly and shiny! Moissanite scores 9.25 on the Mohs Scale of Hardness. That makes it the hardest gemstone used in jewelry next to diamonds (which is a 10). Sparkle wise, moissanite has an even higher refractive index than diamonds, so it's even sparklier than a diamond. Moissanite can also resist heat just as well as diamond where does moissanite come from? Moissanite was first discovered in a meteor crater in 1893 by a scientist named Henri Moissan. Today, naturally-occurring moissanite is incredibly rare.