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
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




