A Labradorite cabochon from Madagascar with multicolour labradorescence.

The effect is due to the layered structure of this variety of Palgioclase Feldspar, also known commercially as Spectrolite, which causes thin-film iridescence, a phenomenon which is beautifully displayed in this cabochon.

To see a short video of the effect on YouTube, please use this link:  https://youtu.be/qohW1NoJl8w

weight:  59.41 carats
shape:   Keystone shape cabochon, bevelled edges
dimensions:   32.29 x 26.80 x 7.36 mm
treatment:  None