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 : 18 | 18.5 | 19 | 19.5 | 20 Size USA: 7.75 | 8.5 | 9 | 9.5 | 10.25Gems size on pictureApproximate metal weight (for ring size 20.25 mm): gold 14k – 2.66 grams; gold 18k – 3.18 grams; silver 925 Sterling – 2.14 grams. Model volume (for ring size 18 mm): 487.7 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