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(There is also genuine color-change sapphire which mimics alexandrite, as well as color-change garnet that can be a real fooler.). The first thing to do is check the refractive index of the stone, since each material has unique optical properties.
The only color which sapphire cannot be is red - as red colored corundum is called ruby, another corundum variety. This variety in color is due to trace amounts of elements such as iron, titanium, chromium, copper, or magnesium. Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry.