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There are ways that you can determine the authenticity and quality of the crystals that the crystal chandelier that you are eying has, one of which is through the use of light. Keep in mind that crystals have the ability to reflect prisms of light, which means that when light passes through the crystals, there should be a full spectrum of colors that would emanate from it, energizing the entire room while dazzling the eyes of those who may gaze upon it.
Ordinary glass chandeliers will not be able to duplicate the spectrum of light that crystal chandeliers are able to produce, so be sure to test them out before making the decision to buy one. Don't forget that the atoms of the crystals are ordered in a way that they can perfectly reflect light and color, so the crystal chandelier that you are eying should be able to interact with light if it is real.