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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.
Color change garnet displays a deep green or blue green under natural light and red or purple under incandescent light. We have recently seen some fine specimens in these from Kenya and Madagascar, and some of them display a strong color change that rivals top grade alexandrite.