New sterling silver cz eternity band ring size 7

New, sterling silver cz eternity band 4 rows of cz stamped 925 size 7 what makes one eternity ring more expensive than another, they look similar? the cut and quality of the stones. Yes, just like diamonds there are differences in cut and clarity. The setting, some are prong set like diamonds, some are part prong set part glued,not all glued. The amount of silver content in the ring, the weight.