Medusa heads were ubiquitous until the end of Greco-Roman antiquity. In amuletic jewelry they were protective amulets1 repelling onlookers2. Such rare amulets mainly in faience2 are of the Roman Period

Medusa head - Green glaze

Green glaze
H 2.5, W 2.0 Roman Period
© 2017 University College
London LDUCE-UC#52174

Medusa head - Gold ring with onyx

Gold ring with onyx
cameo of Medusa head
Ø 2.2, H 1.7 Roman
Period
MET #10.130.1428

References

1See the description of MET #10.130.1428
2Petrie W M F, Amulets, 1914, p. 28 and Figs. 128a,b,c