This faience amulet is of an openwork wedjat eye and has a blue green glaze. The wedjat eye represents Horus' left eye lost in battle and later restored magically by Hathor. The eye came to symbolize wholeness.
From Giza, from debris East of Mastaba G 7759. December 1931: excavated by the Harvard University–Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Egypt.
Harvard University—Boston Museum of Fine Arts Expedition