FA-PREH024YG-042-025
Natural Gems Belgium Colored Stone Certification FA-PREH024YG-042-025
IDENTIFICATION : Natural yellowish green Prehnite (epidote needles inclusions )- 27.13 ct - octagon - unheated - Africa
Species : Natural inosilicate
Variety : Prehnite
DESCRIPTION
Shape & Cutting Style : Octagon, Mixed Cut
Measurements : 20.0 x 17.2 x 10.7
Carat Weight : 27.13 Carat
Color : yellowish green
Clarity : comparable to I3
Transparency : translucent
Birefringence : 0.021-0.033 checked = in margin
Crystallography : Orthorhombic
Dispersion : weak
Luster : Vitreous
Hardness : 6-6.5 checked
Refractive index : 1.611-1.665 checked = in margin
Specific gravity : 2.80-3.00 checked 2.91
COMMENTS :
No indications of heating, no indications of any other treatment
The gemstone is small chipped, just under the girdle
Personal Note From Natural Gems Belgium:
Very large gemstone , natural prehnite included with black Epidote needles. The gemstone has cut grade good, polish is good, and luster is fair to good vitreous, symetry is good.
