Put together this quick-er tutorial on how to make a diamond. It goes over the way I would model one, then a little info about caustics, and finally how to get that prism effect. Also, C4D and AE are put into one file. P.S. - this is a quick render. If you really want to do a high detail rendering, you want to turn on anti-aliasing to best rather than geometry. But that will also increase your render times and I am not known for my patience. Enjoy!