Custom Ring model to be made

Ok I assume I am doing this differently. So I work at a jewellery store and we just got our 3D printer. I am so excited over this fact being a techno geek and I am studying Software Development.

Now the problem part we buy our designs for tour rings of a catelogue thus not much for a creative person. So in my mind (unfortunately) I have a design that I would like to become a reality and our custom designer is ufortunatley not expoerinced enough to modify current designs.

This I know I need well first the design which I can crudley draw and I think the model needs to be in .stl format.

Is their someone out there willing to help me make a ring model its not a very difficult design I think.