I’ve heard some Moissanite can have a yellow colour/tint?
Charles and Colvard hold the rights to a patented Moissanite creation process which produces near-clear Moissanite stones, which many people claim have no tint or hue at all. Often Moissanites high level of dispersion (fire) can confuse people as Moissanite has nearly 2.5 times more than a diamond.