IGI Certified Hackmanite ( Sodalite ) . It has very attractive color & sparkling luster, it has feather’s & visible inclusions but less visible than in the photos. It’s quite rare to find gem grade hackmanite. It has strong fluorescence & its unusual gem, it exhibits a special optical property know as tenebrescence,” a type of reversible photochromism . This feature allows gems to temporarily change color when exposed to different light form . There are very limited production of deep purple color of hackmanite. Rare Gem Collectors IGI Report No : 754553030 Weight : 4.97 ctw Color : Deep Purple Cut : Cushion Mixed Cut Measurements : 11.74 X 10.12 X 8.50 mm Characteristics : Natural inclusions pattern Comment : Tenebrescence Effect No indication of thermal treatment/ Not mentioned in report Origin:Badakshan Afghanistan / Not mentioned in report Shipping will be via FedEx with full insurance