The sun disc is usually on a small low stand. It granted the wearer to be united with the sun god and with a daily rebirth. Amulets are mostly in dark stones and faience1. Position on mummies: stomach1. They were produced from Dynasty 26 onwards

Undefined stone
H 1.7, W 1.5, T 0.4
Dynasty 26 or later
Brooklyn Museum #37.1165

Blue glaze H 1.6, T 0.6
Undated
© The Trustees of the
British Museum
#EA33867

Rare example in limestone
H 1.8, W 1.7, T 0.8
Late Period
World Museum Liverpool
#M11978g

Reference

1Andrews C. Amulets of Ancient Egypt, 1994, p. 89 and Figs. 90c,d