FA-KYAN026BL-003-556

Certificate : FA-KYAN026BL-003-556
Gem Type: Natural Kyanite
Weight: 1.645 Carat
Shape: oval, mixed cut
Size: 8.1 x 6.0 x 3.8 mm.
Color:  Medium to Deep Blue
Clarity: Transparent
Luster: submetallic
Treatment: no indications of heating or other treatment
Optical Phenomenon : typical natural inclusions for high quality gemstones sri lanka

Birefringence : 0.015 to 0.016
System: Triclinic
Crystallography : distinct bladed crystal habit
Dispersion : 0.012 to 0.020 
Luster : Vitreous
Hardness : 4.5 to 5
Refractive index: 1.710 to 1.734 
Specific gravity : 3.65-3.68