Fly amulets are common since the Predynastic Period1. Most seem purely apotropaic and intend either to keep away from their wearers this disturbing insect or to emulate fecundity1. The earliest are in ivory, serpentine, and steatite and later on in semi-precious stones, gold, faience and glass1

Green serpentine fly amulet

Green serpentine H 1.4
possibly Late Old Kingdom
© 2017 University College London #LDUCE-UC15257

Lapis lazuli fly amulet

Lapis lazuli H 0.5, W 0.6
Middle Kingdom
reign of Amenhemat II
© 2015 Musée du Louvre/Antiquités égyptiennes #E 15272

Gold fly amulet of a collar

Gold of a collar H 1.2
Second Intermediate Period-New Kingdom, Dynasty 17
MET# 2012.237.1

Reference

1Andrews C. Amulets of Ancient Egypt, 1994, pp. 62-63 and Figs. 4b, 48c