Natural Blue Topaz , 2 pc(s) , Weight : 2.23 ct , Shape / Cut : Trillion Cut , Size : 6 mm avg. Color : Sky Blue Clarity : VVS-VS, Brilliance/Fire : Excellent Brazil Hardness : 8 on Mohs' Scale, Specific Gravity : 3.4 - 3.5 Refractive Index : 1.61 - 1.64, Treatment : Heated