Original sentence: Moissanite is harder than cubic zirconia (9 1/4 vs.Synthetic moissonite is approximately as hard as diamond, with a similar index of refraction and greater dispersion; these qualities make SiC a decent and durable diamond simulant.This results in a stone of higher lustre, sharper facets and good resilience: loose moissanites may be placed directly into ring moulds, the stones remain undamaged from temperatures up to twice the 900°C melting point of 18k gold
Edited sentence: Moissanite is much harder than cubic zirconia (9 1/4 vs.Synthetic moissonite is approximately as hard as diamond, with a similar index of refraction and greater dispersion; these qualities make SiC an excellent and durable diamond simulant.This results in a stone of higher lustre, sharper facets and extraordinary resilience: loose moissanites may be placed directly into ring moulds, the stones surviving unscathed from temperatures up to twice the 900°C melting point of 18k gold