INFORMATION RECORDING MEDIUM, AND AUTHENTICITY/FORGERY DISCRIMINATING METHOD

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PROBLEM TO BE SOLVED : To provide an information recording medium made of a material which is hard to obtain and easy to work into various shapes, and a method for discriminating authenticity/forgery . SOLUTION : A material composed of a rare earth element oxide developing different colors under ultraviolet rays, infrared rays and visible light is used as the authenticity/forgery distinguishing information recording medium. A block-shaped monocrystal composed of the material or a powder layer composed of a powder material is arranged in the information recording medium with an information recording part.