New 3ct Certified moissanite pendant with a chain, white D color ,VVS1 clarity. 9mm round cut. Sterling silver pendant, chain 18inc Very sparkly and shiny! Paperwork included 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.