And the resulting render, using a HDR image for the environment, rendered in mental ray with final gathering only (no GI or caustics)
Its only a quick 10 min model, set up and render demo so you might be best off playing with the material settings, I also added a sampler info node connected to a ramp to control the reflectivity (so it gets more reflective as the material moves away from the camera)
Hope it helps
"No pressure, no diamonds" Thomas Carlyle