New 4ct moissanite ring, white G color VVS1 clarity. 10mm. Very sparkly and shiny, sterling silver, ring size is 7 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