New Beautiful 5ct moissanite ring, white H color VVS1 clarity. 11mm. Very sparkly and shiny, solid 925 sterling silver, ring size is 7 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