Natural CORUNDUM. BLUE SAPPHIRE.

PHYSICAL DATA COLOUR : BLUE. TRANSPARENCY: Transparent. SHAPE & CUT : Oval / Mixed cut. WEIGHT : 1.81 ct. MEASUREMENTS : 7.50 x 6.16 x 4.87 mm. TESTED DATA REFRACTIVE INDEX : 1.762 - 1.770 (DR - 0.008) SPECIFIC GRAVITY : 4.0 (+/- 0.1 HARDNESS OPTICAL CHARACTER : 9.0 (ref data). : Double Refractive. PLEOCHROISM : Dichroic. ABSORPTION SPECTRUM: Corresponding absorption detected. FLUORESCENCE : (swuv) Inert. (LWUV) Red (W). MAGNIFICATION : Growth Structure, Crystal inclusions, Feather inclusions, Saturn inclusions.