Emerald — specimen 0594, photo © NMNHS
Afghanistan, Panjshir, Panjshir Valley, 35.42639°N 69.83333°E
Weight: 0.05 ct; size: 2.39 | 2.35 | 1.54 mm; shape: octagon; colour: light very slightly bluish green; very slightly greyish; clarity: eye clean; cut: excellent; treatment: none.
Very clean specimen; design ‘Octangulum Quardum’, excellent cut by Tan Pen.
More information from ‘Classification’
A green variety of the beryl; coloured by chromium or/and vanadium.