If you have any questions, please call us at 213.995.9595 ext. Our office hours are monday through friday 8 a. Moissanite is a unique mineral with the chemical composition silicon carbide (sic). While being a naturally cocurring compound, it has only been found on earth in scarce quanitities at meteor impact sites, and so, is extremely rare in the natural form. Its optical properties outperform those of diamond ni every measurable category. Does not cover loss of fire or brilliance due to user inflicted damage such as.New 41 ct loose princess cut genuine moissanite 40 mm moissanite show the fire and scintillation that cannot be captured by still photos. All moissanite weights are presented in their diamond equivalent weights, by volume.