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-6.8g 16.5mm-7.01g 17mm-7.23g 17.5mm-7.44g 18mm-7.66g 18.5mm-7.87g 19mm-8.09g 19.5mm-8.3g 20mm-8.52g 20.5mm-8.74g 21mm-8.95g. Width: 5.6mm Round stones: 6 (2.7mm).