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Of cource, Sapphire can change the colour by heat. The reason is rechange of the impurity ions at crystal. But it is not the chemical process, but physical. And I didn't hear about using of the chemicals for such change of the color. You can have a different color if you will be to add the different impurties to the sapphire by growing. For example, the doping by Cr3+ white sapphire you will be to have in result Ruby (red colour).