Add on Screw BacksNever Lose Your Diamond Earrings Again! As a jeweller that specialise in selling diamond earrings, we cant recommend enough to add on screw backs to your diamond studs. (that is if you are going to leave them in) When you invest in a beautiful pair of diamond earrings, you want to make sure that those diamond earrings stay firmly on your ears. As you might guess from their name, screw backs are a type of earring back that screws into place. Screw