Corundum

Sapphire

Tanzania, Tanga Region, Umba Valley ( Gemological observations suggest this sapphire could be either of Madagascar or Tanzania origin)
Identifier
33087
Refractive Index
1.7600
Specific Gravity
4.04
Optical Character
Uniaxial −
Pleochroism
Violet / Light brown
Luster
Vitreous
SUN
I
F
LED

Absorption Depth

0.1
0.3
0.6
1.0
1.5
2.5
4.0

Absorption Spectrum

400450500550600650700750Wavelength (nm)0123456Absorption