I would assume so too, except that initially De Beers was arguing that natural diamonds were more pure than the lab-made. When lab-made beat every criteria, 3C

I would assume so too, except that initially De Beers was arguing that natural diamonds were more pure than the lab-made. When lab-made beat every criteria, 3C and whatnot, created by the diamond cartel, the cartel started to argue for impurity.