intaglio
noun [in-​ta-​glio]

1a. an engraving or incised figure in stone or other hard material depressed below the surface so that an impression from the design yields an image in relief
b. the art or process of executing intaglios
c. printing (as in die stamping and gravure) done from a plate in which the image is sunk below the surface
2. something (such as a gem) carved in intaglio

The NEET King ring had been passed down for generations, and bore an intricate intaglio signet.