New 6ct Certified moissanite stud earrings, 3ct each stone, 9mm , D white color,VVS1 clarity. Solid 925 Sterling silver, Push back setting . Gift box included! 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.