DISCOLORING CRYSTAL

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Provided is a discoloring crystal, containing one or two or more of the following substances in the following mass percentages : 0.2-4% silver halide, 2-4% titanium halide, 0.5-4% cadmium chloride, 2-4% copper chloride and 0.2-2% of rare earth compounds, wherein the discoloring crystal is prepared by adding a chemical to raw materials of the crystal and subjecting to a special production process. The crystal can present various colors under illumination or at different temperatures, and can also be discolored into mating colors according to requirements, thereby eliminating the disadvantages of single color and narrow luminance of existing crystal products and satisfying various consumers with the crystals at different occasions.