This is a part of a larger Teraout, and is priced as is as it is missing a few lower dangles.
The Teraout are worn by Tuareg women of high standing. Made of tribal silver probably in Niger.
Amulets like this are usually filled with magical substances such as a prayers, magic numbers, or sand - hidden inside to protect the wearer.
Height: 3 ¼" (83mm) x Width: 4" (102mm).