What’s the Moissanite? Moissanite has the chemical formula SiC and is a rare mineral. Because of its hardness, it can be used in high-pressure experiments, as a replacement for diamond. Since large diamonds are usually too high in cost to be used as anvils, synthetic moissanite is more often used in large-volume experiments. Perfect Replacement for Diamond Moissanite is the closest gemstone to diamond in the world which can 100% pass the diamond pen. Although moissanite is a replacement, the fire is higher than diamond and is 4.5 times as high as diamond, the brilliance is more dazzling. GRA Certificate for every Moissanite Each moissanite stone has been strictly inspected by GRA to D VVS1 and has a report number. Product Size 0.1ct=3.0mm ,0.2ct=3.5mm, 0.3ct=4mm, 0.4ct=4.5mm,0.5ct=5.0mm, 0.6ct=5.5mm, 0.8ct=6.0mm, 1.0ct=6.5mm, 1.2ct=7.0mm, 1.5ct=7.5mm, 2.0ct=8.0mm, 2.5ct=8.5mm,3.0ct=9.0mm, 3.5ct=9.5mm, 4.0ct=10mm, 4.5ct=10.5mm 5.0ct=9x11mm Product Features: 1.Moissanite can be used as a raw material for engagement ring, a pair of stud earrings and a necklace. 2.Moissanite is durable, tough and extremely resistant to scratching and abrasion. With a hardness of 9.25, moissanite is harder than all other gemstones except diamond. 3.Moissanite does undergo a temporary color change when exposed to extreme temperature from a jeweler's torch during jewelry repair, but with proper bench techniques there will be no lasting damage, and the stone will return to its normal color once it cools. Specification: Shape: Round Color: D color Clarity: VVS1 Cut: Excellent Cut Package Content: 1x Moissanite stone 1x Jewelry Box 1x GRA certificate