GIA report online : 5202994264 Shape..................Pear Color.......................Grayish violetish Blue changing to Grayish purple Species................... Natural corundum Variety........................Natural sapphire Geographic origin........Medagascar Treatment : No indication of heating Weight : 6.00 carats Measurements : 13.19 x 9.49 x 6.07mm Comments : color change under daylight or fluorescent. The stone was selected by Tal Naaman ,Gem Hunter and sent to the GIA Lab in New York Country of Origin is an opinion offered by the seller of this item; this opinion is not substantiated by an official opinion of the Laboratory Insured international shipping with Track & Trace