Average Grades
Product description
Black Onyx oval Cabochon to be stuck on or to be set
Sold per piece.
Unset.
Length : 14mm
Width : 10mm
Each bead is unique and can be very different from the picture.
The onyx belongs to the Chalcedony family. Black onyx stone is not originally black. It is treated by being immersed in a solution of black sugar and acid. The soft, porous nature of the stone allows the solution to soak in. After immersion, the stone is then heated. This is a common process that makes the colour deeper and longer lasting.
