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Demantoid garnet is a brilliant green variety of Andradite Garnet, colored by chromium and ferric iron. It's considered to be the rarest and most valuable member of the Garnet group of minerals. Demantoid has an exceptionally high refractive index making it the most brilliant Garnet. Demantoid Garnet has more fire and dispersion than fine Diamonds. A valuable quality of Demantoids from Russia is they often contain a desirable horsetail inclusion.