twobirch sterling silver infinity bypass engagement ring guard with cubic zirconia (3/4 ct., size 8) twobirch this wedding ring guard has 28 round, prong set stones. each band measures 2 millimeters wide. this ring enhancer has .74 carats total weight. this ring jacket is made to fit a round or princess cut solitaire from 0.5 carats to 2 carats; a marquise solitaire from 0.5 up to 1.5 carats.