This collection of rings is ready for 3D printing.Ring sizes 15.5 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):15.5mm-3.02g 16mm-3.12g 16.5mm-3.2g 17mm-3.29g 17.5mm-3.38g 18mm-3.47g 18.5mm-3.56g 19mm-3.65g 19.5mm-3.71g 20mm-3.81g 20.5mm-3.91g 21mm-4.01g. Width - 3.5mm. Round stones 2.5mm