There are nurbs surfaces. Easy to edit.
The ring size is 17.5mm
Weight for size 7 14K-12g 18K-14g Silver-10g
Models fixed with RP Magics software and ready for prototyping on CNC or any 3D Printing. .Stl file is for printing and 3DM source file for editing or modifying.Tested in production. If you have any questions or suggestions please contact me.