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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.
Synthetic sapphire has pretty much the same atomic and optical properties of a natural sapphire. Unless you're a certified gemologist with a powerful microscope, you won't be able to tell the difference between created and mined gemstones. Lab grown sapphires may even look better than their natural counterparts!