Mohs Hardness: 6.5 to 7.5 out of 10
Color: Generally dark toned brownish orange to brownish red to purplish red, with low saturation.
RI: 1.714 to 1.888
SR/DR/AGG: SR, often with ADR
Spectrum: 3 strong bands in the green and yellow at 505, 527 & 575nm
SG: 2.72 (+0.18 / -0.05)