Moissanite is regarded as a diamond alternative, with some  optical properties exceeding those of diamond. It is marketed as a lower price  alternative to diamond. As some of its properties are quite similar to diamond,  testing equipment based on measuring thermal conductivity in particular may give  deceiving results. On the Mohs scale of mineral hardness moissanite is rated as  9.5, with diamond being 10. Because of its hardness, it can be used in  high-pressure experiments, as a replacement for diamond Moissanite Hoop Earrings Details: Gem Total Weight: 3 Carat Gem Shape: Round Gem Type: Moissanite Gem Color: D-E Color Gem Size: 4.0mm/0.3ct x 10pcs Metal: Thick Gold Plated 925 Sterling Silver Plating Color: White Gold