It doesn't really matter, tbh. The patent for moissanite is held by Charles and Colvard, so no matter where you shop for them they will be coming from them (and should have an authenticity certificate too, btw).
Charles and Colvard has an online shop you can find by googling.
No affiliation, my wife's stone is just also a moissanite.
Charles and Colvard actually lost their patent a while ago...I wanna say two or three years in August?
I'm a huuuuge proponent of moissanite, but it's one of the reasons I am slightly wary of purchasing moissanite online without at least speaking to the seller. Moissanite doesn't always come with a certificate. In my mind, though, if you love it and can afford it, who's to tell you it's fake?
