Green Onyx Stone/- 5.25 Ratti - (VS Grade) 100% Natural, Certified and Mantra Treated Onyx

The Gemstone Onyx. ... Its most accepted gemstone definition describes a solid black Chalcedony, or a banded or layered black and white Chalcedony. The term Onyx is occasionally used to described any engraved stone with a solid color base, or it may describe any banded gemstone with parallel banding.