This ivory ear stud has a mushroom-shaped head. The shaft is separate and fits onto the head with a pin and socket.
From Kerma: tumulus K 4, grave 440x. 1914: Excavated by the Harvard University–Boston Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Sudan. (Accession date: March 1, 1920)
Harvard University—Boston Museum of Fine Arts Expedition