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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 color must be neither too dark nor too light to be considered finest quality. If the color is too dark it has a negative effect on the stoneâs brightness. At the other extreme, if the color is too light, the stone is considered pink sapphire, even if color strength or intensity is high. Some gem dealers debate the borderline between ruby and pink sapphire. Historically, the word ruby referred to shades of red, which technically included pink.