Realistic 3D Diamond Animation Scene in Maya 2011

I want to create a realistic 3d diamond animation. Result should be similar to: [login to view URL] I am currently using Maya 2011 with Mental Ray. I also have access to vray for Maya but I prefer not to use it. I have a Maya scene with a good diamond model animating in the desired manner, but the render itself is very far from being realistic or close to the example (diamond looks like plastic). I would like someone to take my Maya scene and tweak it for rendering nicely. I assume the following is needed to be done: (1) adding correct light sources (2) choosing a correct material for the diamond (3) tweaking the rendering settings I have the following requirements from this project: (1) Basing your work on my Maya scene and my model (2) I want to be able to render the animation myself on my computer (with Maya 2011) (3) The render should take no more than around 30 minutes per frame on a common home pc (4) The rendered result should be similar to the given example: [login to view URL]