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 Size USA: 6.5 | 7.25 | 7.75 | 8.5 | 9 Gems size on pictureApproximate metal weight (for ring size 17mm concave / convex): gold 14k – 2.48/2.87 grams; gold 18k – 2.97/3.44 grams; silver 925 Sterling – 2/2.31 grams. Model volume (for ring size 18 mm): 192.8/223 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