Modern Gold Ring CAD Design

I need a complete 3D CAD model for a modern-style gold ring. I will provide finger size, reference images, and any stone measurements once we start; what I need back is a clean, production-ready file that a jeweler can cast without extra revisions. Please work in the software you are most comfortable with—Rhino, MatrixGold, Z-Brush, or similar—so long as the final deliverables include the native file and a high-resolution STL.

Key deliverables
• Editable CAD file of the ring
• Watertight STL ready for printing
• One minor revision round after I review the initial render

Accuracy in dimensions, smooth surfaces, and proper tolerances for gold casting are essential for approval.