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-1.32g 16mm-1.35g 16.5mm-1.39g 17mm-1.43g 17.5mm-1.48g 18mm-1,52g 18.5mm-1,56g 19mm-1,59g 19.5mm-1,63g 20mm-1,68g 20.5mm-1,72g 21mm-1,76g. Round stones 1.8 mm.