Blender3d Cycles Crystal

I like the bottom right one the most; the fogginess of the crystal makes it very believable. Crystals usually must be cut/polished before they look clear, but the way it is bunched up in a ball suggests that it is in a natural form.

This looks realy lifelike.

But just form the beauty site I think the crystals you do with the internal render engine looks more cineastic and spectacular.
Maybe because your lightsetup are better there.