inner diameter of the ring is 17.7mmthe thickness is 2mm.whole weight is 8.95 gr 18 ky or 8.51 gr 18 kw. there are 19 dimond with the diameter of 1.5 mm in brilliant cut.Join me to place your orders with your own sizes and modifications. my linkedin ID : http://www.linkedin.com/in/forough-peivandi-502266303