A Bastnaesite gemstone from the Zagi mountains, Khyber Pakhtunkhwa province, Pakistan.

Bastnaesite is a rare cerium-bearing carbonate-fluoride mineral with chemical formula Ce(CO₃)F.

Along with its distinct pleochroism, it also displays a slight colour shift reverting from an burnt-orange colour with secondary yellow flashes in daylight and household LED lighting to a reddish-orange colour in incandescent light

This exceptional example of the species is eye clean, precision cut and has a deep, saturated body colour.
It is provided with a certificate of authenticity from the Asian Institute of Gemological Sciences of Thailand (AIGS).

To see a short video of this gemstone on YouTube, please use this link: https://youtu.be/I397ScZeDwM

weight:  6.70 carats
shape:  Oval cut
dimensions:   10.14 x 9.29 x 6.67 mm
treatment:  None