Just put a an emssive map in key locations and bake the emssive light, while feigning a light opacity. As Valias said, those crystals are 'boosted', so you can get away with alot of simplicity in the materials just by using the basic nodes, a few camera nodes if you want to get fancy, but I don't see clear relfection in…
What!? That's nuts! There's no way you can get the look he's after with baked textures. For the crystals you want a very bright specular highlight (greater than 1) and you want a specular power of about 15. If you make the material 2 sided and transparent you're going to run into a lot of triangle sorting problems and it…