Headrest amulets were a substitute helping the deceased to rise his head for resurrection. These amulets are mainly in hematite or other dark stones such as obsidian, diorite and basalt1. Headrests amulets were only found in royal burials up to the Third Intermediate Period but became very common mummy amulets from the Saite Dynasty 26 onwards1
References
1Andrews C. Amulets of Ancient Egypt, 1994, pp. 95-96 and Fig. 95




