Boulder opal 13.9ct 17.8x 15.8mm Australian opal natural solid loose unset stone

DETAILS: No8899 Natural solid boulder opal loose stone
Stone Natural solid boulder opal
Carat 13.90ct
Dimensions 17.85mm x 15.88mm Thickness 5.25m (at the longest point)
Shape Freeform
Colour Bright green, blue, yellow, red
Transparency Opaque
Origin Winton, Queensland, Australia
Note: *It has a slight undulating surface but smooth polish.
Last picture is back of the stone.
All photos were taken under natural light, sunlight and LED lights.
*Please check the measurements before purchase, the items appear bigger in photos.