Sterling silver ring inlayed with copper, Whitby jet

Sterling silver ring with Whitby Jet. Unique ring with copper inlay and hammered to give it texture. There is only on the surface so doesn’t come in contact with skin,  unique WhitbyJet. 
Size R
The jet discovered at Whitby is of the Jurassic age, approximately 182 million years in the making. Found in the debris from fallen cliffs and across the North York Moors, Whitby jet is of the finest in the world and has the reputation as the 'gold standard' in jet. Jet has been mined and used since the Bronze Age.