Demantoid is the emerald-green andradite garnet whose dispersion — fire — actually exceeds diamond's. Russian Ural stones with their signature “horsetail” inclusions are legendary; Namibia and Madagascar supply fine modern material. Hardness 6.5–7, and always natural color.GEMIC Institute's demantoids are laboratory-certified, with video showing the fire of the exact stone offered. Each is one of a kind; worldwide tracked shipping and our 30-day guarantee apply.