Isis and her sister Nephthys mourning are protective funerary amulets in the characteristic gesture of lamentation. They were placed on the upper chest of mummies of the Ptolemaic Period to facilitate the resurrection of the deceased as they managed with Osiris1

Gold pectoral of Isis and Nephthys mourning

Gold pectoral L 7.7, H 6.7, T 0.1 Ptolemaic-Roman Period
© 2005 Musée du Louvre/Christian Décamps #E 4923

Reference

1Andrews C. Amulets of Ancient Egypt 1994, p. 48