** SOLD **
An Amber cabochon from the Barisan mountains of Sumatra, Indonesia.
The gem appears an unexceptional dark orange-brown colour in normal household lighting.
However when exposed to direct sunlight, it appears a chalky blue colour due to the natural fluorescence of the material.
Image 4 shows the gems reaction when exposed to standard longwave UV light.
weight: 21.58 carats
shape: Oval cabochon
dimensions: 31.00 x 21.18 x 13.01 mm