Silver Ring CAD Model

I need a detailed CAD model of a ring that will ultimately be cast in silver. I already have loose sketches and a clear idea of the style, but they need to be translated into a production-ready 3D file. The final model must respect standard jewellery tolerances, include smooth surfaces suitable for polishing, and be supplied in a file format ready for both rendering and 3D printing/casting (STL and STEP are ideal).

Because the exact finger size is still being confirmed, please keep the design fully parametric so we can adjust the inner diameter without re-working the whole model. If you can also generate a few quick photorealistic renders showing how the piece will look in polished silver, that would be a bonus.

Deliverables:
• Editable CAD file (STEP or similar)
• Print-ready STL
• Two or three high-quality silver renders

Once I approve the final geometry and visuals, the project is complete. I welcome any quick suggestions or questions before you dive in.