Smoky quartz — specimen 0674, photo © NMNHS
Smoky quartz — specimen 0674
Weight: 0.39 ct; size: 5.83 | 4.88 | 3.23 mm; shape: oval; colour: dark reddish orange; clarity: eye clean; cut: excellent; treatment: none.
Very clean specimen; design ‘Ovalimixtum ST’ [crown angle changed to 21.00], excellent cut by Tan Pen.
More information from ‘Classification’
Smoky-grey, brown to black quartz coloured by Al-based and irradiation-induced colour centres.