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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.
Most people who think of sapphire picture the color blue. Besides blue sapphire and ruby, the corundum family also includes so-called âfancy sapphires.â They come in violet, green, yellow, orange, pink, purple, and intermediate hues. There are also âparti-coloredâ sapphires that show combinations of different colors.