Model is ready for 3D Printing and prototyping on CNC. Geometry is healed, and fixed all the bad with RP Magics software Ring sizes: inner diameter mm : 17 | 17.5 | 18 | 18.5 | 19 | 19.5 |20 Size USA: 6.5 | 7.25 | 7.75 | 8.5 | 9 | 9.5 | 10.24Gems size 1.8mmApproximate metal weight (for ring size 18 mm / lightweight): gold 14k – 11.8 / 7.39 grams; gold 18k – 14.1 / 8.84 grams; silver 925 Sterling – 9.48 / 5.94 grams. Model volume (for ring size 18 mm / lightweight): 915 / 573.3 cubic mm. You can check out my other products by clicking on the author name s.kim_jewelry_design. Any questions? Please contact me. instagram @s.kim_jewelry_design email skimjewelrydesign@gmail.com facebook s.kim_jewelry_design youtube SKIM Jewelry Design