Diamond with PBR material on accurate geometry model 3D model

This is a diamond model created following the correct cut angulation, in order to replicate the tipical reflection of a diamond. This is model run on cycles with a PBR material home made, the RGB split light is based on real data.

The polygon data are refer to a single diamond model, obviously the render scene (like in figure of gallery) is more complex (~239verts).

Not plug in or modifier are necessary in this case.