A method of treating sapphire material to modify the reflected color of the surface of a sapphire material, including irradiating a beam of single and / or multiply charged gas ions so as to change the reflected color of the surface of the treated sapphire material (31, 32, 33), compared to untreated surfaces (30), the ions are selected from the element ions from the list consisting of helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), boron (B), carbon (C), nitrogen (N ), oxygen (O), fluorine (F), silicon (Si), phosphorus (P) and sulfur (S).
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