This collection of rings is ready for 3D printing.Ring sizes 16.3 16.6 17.2 17.5 17.8 18.3 18.6 19.1 20.3 20.7 21.2 21.5 mm. Approximate weight of rings by size(GOLD 14K): 16.3mm-5.9g 16.6mm-6.04g 17.2mm-6.21g 17.5mm-6.24g 17.8mm-6.3g 18.3mm-6.48g 18.6mm-6.6g 19.1mm-6.8g 20.3mm-7.21g 20.7mm-7.34g 21.2mm-7.53g 21.5mm-7.62g.Width: 6.5mm Round stones: 1.5mm. I can make to order with your parameters.