It is known to have a smooth surface with rounded edges and can be carved or inlaid into many objects.
Onyx can also be black with white banding in its most common form. Onyx stone is a type of chalcedony that is a form of microcrystalline quartz with straight, nearly parallel bands or layers of color, allowing skilled gem carvers to cut away material to create cameos and intaglios of extraordinary depth and contrast.
