For this project I used Solid Works to crate my Ring, and used these steps:
1) Started by sketching two circles, 15 mm and 12 mm.
2) Then Boss Extrude to make a thickness of 3mm.
3) Use revolves to make the spherical shape, which represent the diamond.
4) Use fillet to make the edge be more circular.
4) Finally, choosing Brass to me the material.