gorget

A polished shell pendant worn around the neck in Native America cultures, including the Hopewell and Mississipian. Gorgets are often engraved, and are sometimes pierced with openings or colored with pigments.

Engraved shell gorget with a supernatural warrior holding a severed head and mace. Mississippian.  1250-1350 CE. National Museum of the American Indian, Washington, D. C.