PLEASE NOTE: I am away from Sat 24th July until Friday 6th August. From midday GMT on Thursday 22nd July, You are welcome to place orders, but they will not be processed and dispatched until my return.


Onyx is formed of bands of Chalcedony in alternating colours. Its bands are parallel to one another, as opposed to the more chaotic banding that often occurs in agates. Black Onyx is perhaps the most famous variety but is not as common as Onyx with coloured bands.  Most Black Onyx on the market is artificially coloured.