Many mineral pendants were used in Nubia as amuletic jewelry 1
Gold nugget pendant H 3.3, W 2.4, D 1.8 Napatan Period MFA #23.311
Amazonite with the cartouche of Taharqa and plant fiber H 11.4, W 5.1, D 3.8 Third Intermediate Period, Late Dynasty 25 Brooklyn Museum #51.134
Reference
1Lacovara P & Markowitz Y J, edited by D’Auria S. Nubian gold. Ancient jewelry from Sudan and Egypt, 2019, The American University in Cairo Press, pp. 26-27 Fig. 6 and p. 50 Fig. 32