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 mm. Approximate weight of rings by size(GOLD 14K): 16mm-6.28g 16.5mm-6.55g 17mm-6.73g 17.5mm-6.91g 18mm-7.1g 18.5mm-7.28g 19mm-7.47g 19.5mm-7.65g 20mm-7.81g.20.5mm-7.97g 21mm-8.15g Width - 6mm. Thickness - 2.1mm.Gem stone: 74-92