According to GIA GEmSet: stpR 6/5 strongly purplish red, medium dark, strong
Cutting Style
Heart
Measurements
7.84x9.41x6.47
Weight
3.82 ct
Luster
Vitreous
Transparency
Transparent
Refractive indices
1.770 - 1.762
Birrefringence
0.008
Optic sign
-
Hardness
9 Mohs
Cleavage
None
Density
4.02
Absortion spectra absorción
Due to chromic oxide
Picture
Comments
This gem have been treated with glass fissure filling. Fissure filling material may be unstable to elevated temperatures and to chemical agents. Special care should be taken when cleaning or reparing jewelry items set with fissure filled corundum.
Small rounded crystals altered by heating. Darkfield illumination, 15X.
Small rounded crystals altered by heating and colour flashed revealing the glass filled fractures. Darkfield illumination, 40X.