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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.
1 Cornflower blue is the most desirable color in a Sapphire. 2  Fancy Sapphire-Describing any Sapphire with a color other than blue. 3  Kashmir Sapphire-Sapphire with an intense, velvety-blue color, described from the Kashmir Province of India.4  Kashmir Sapphire is considered to have the finest color of all Sapphire.n exotic type of sapphire, known as Color Changing Sapphire, displays a different color depending on its lighting. In natural light, Color Changing Sapphire is blue, but in artificial light, it is violet. (This effect is the same phenomenon well-known in the gemstone Alexandrite).