This tourmaline is unique in the collection. It is a color changer from golden brown in incandescent light and green in daylight. Neither color really grabs you, but the color change is hard to miss. I looked at the stone with my spectrometer and I believe that this is a Dravite, the species. Dravite is a member of the tourmaline group, but it comes from a completely different geological setting, metamorphic rock while Elbaite, the more common species in gemstones comes from igneous pegmatites. The rough probably came from the same area in East Africa where they find “chrome” tourmaline. The gemological properties are all good and even without change color it is a bit different and attractive. It weighs 2.92 carats.