Earflare or headdress ornament

Shell-shaped piece of jade with curved surface and 2 holes in one side. 7 carved geometric heads incised with black pigment? on top side, appear to record seven god names. This remarkable jade shell may have been part of a headdress - probably the ear ornament of a god's portrait mask. It's size and quality, and the names written on it, suggest that it was part of a ruler's regalia, probably only worn on the most solemn state occasions. Like other important jade ornaments, it was either placed in its owner's tomb or retained for burial with a later noble.