The ankh is one of the most represented hieroglyph, which means life. Such amulets, surprisingly pretty rare1, are mainly in blue faience but other materials, including gold, were also used2. They were sporadically produced from the Old Kingdom to the New Kingdom1 but were much more frequent in the Late Period1,2

Hematite cowroid in gold mount L 1.2, W. 0.7, T 0.3
New Kingdom
MET #36.3.48

Gilded Wood
Dimensions and Period?
© 2016 Musée du Louvre/
Christian Décamps
#AF 13585

Blue glaze
H 1.8, W 0.8,T 0.4
Late Period
Private collection DA

References

1Andrews C. Amulets of Ancient Egypt, 1994, pp. 86-87 and Fig. 89
2Petrie W M F. Amulets, 1914, p. 14 and Fig. 30