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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.
Sapphire (Al2O3). Synthetic Sapphire is a single crystal form of corundum, Al 2 O 3, also known as alpha-alumina, alumina, and single crystal Al 2 O 3. Sapphire is aluminium oxide in the purest form with no porosity or grain boundaries, making it theoretically dense.apphire (Al2O3). Synthetic Sapphire is a single crystal form of corundum, Al 2 O 3, also known as alpha-alumina, alumina, and single crystal Al 2 O 3. Sapphire is aluminium oxide in the purest form with no porosity or grain boundaries, making it theoretically dense.