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-5.86g 16.5mm-6.02g 17mm-6.19g 17.5mm-6.42g 18mm-6.54g 18.5mm-6.7g 19mm-6.86g 19.5mm-7.03g 20mm-7.19g 20.5mm-7.38g 21mm-7.55g Width: 6.5mm Round stones: 1.5mm. I can make to order with your parameters.