Why choose SOFIA's Jewels & Moissanites? Sofia moissanite are premium moissanites made from silicon carbide – 4H crystalline polytype version, they are D-E color, VVS1/VVS2 clarity and excellent cut, better quality than most moissanite on the market. And each our moissanite comes with a certificate report and unique number. Please note, however, that our moissanites are not numbered, whereas most moissanite jeweler on the market is not numbered.