I'm looking at purchasing some diamond earrings soon, most likely studs. I don't necessarily care about certification for earrings as long as they perform well. Ready-set-to go earrings atare all ideal cut based on their in-house graduate gemologist. Is this close enough to the same rating from a GIA or AGS certified stone? Not being able to upgrade in the future if I went with a pre-fab set is not the biggest issue.