Black Onyx Crystals UK | Polished Black Stone

Black onyx is a variety of chalcedony with a deep, uniform black colour and a smooth, highly polished finish. It is widely used in jewellery for its classic appearance and the strong contrast it creates against metal settings and lighter stones.

Our black onyx range includes polished tumblestones, bracelets and pendant necklaces. For a wider selection of dark stone jewellery, browse our dark stone jewellery collection. See also black obsidian and tourmaline crystals. Free UK delivery over £30.