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-2.02g 16mm-2.08g 16.5mm-2.14g 17mm-2.2g 17.5mm-2.26g 18mm-2.32g 18.5mm-2.38g 19mm-2.44g 19.5mm-2.5g 20mm-2.56g 20.5mm-2.62g 21mm-2.68g. Width - 2.8mm. Round stones 1.8 mm