The disclosure provides a smart jewelry device including a metal housing, two charging contacts, an insulating member, and a battery. The metal housing has a hollow portion, and the metal housing is axisymmetric relative to an axis. The two charging contacts are located on the axis and are respectively located at two endpoints of the metal housing. The insulating member is disposed among the metal housing and the charging contacts. The battery is disposed within the hollow portion and is electrically connected to the charging contacts.