This collection of rings is ready for 3D printing.Ring sizes 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 mm. Approximate weight of rings by size(GOLD 14K): 16mm-7.06g 16.5mm-7.27g 17mm-7.49g 17.5mm-7.71g 18mm-7.92g 18.5mm-8.14g 19mm-8.35g 19.5mm-8.57g 20mm-8.78g 20.5mm-8.99g 21mm-9.21g. Width: 5.6mm Round stones: 3 (2.7mm).