It's interesting that until recently, C&C held multi national patents on moissanite (silicon carbide) for jewelery. It seems like the patent specifically covers

It's interesting that until recently, C&C held multi national patents on moissanite (silicon carbide) for jewelery. It seems like the patent specifically covers lab grown gems. These patents only expired in the last few years, and as recently as 2018 in Mexico. https://patents.google.com/patent/US5723391 https://patents.google.com/patent/US5723391