The Argent Necklace is a silver pendant which is an old family heirloom of theirs. It once belong to Kate Argent then she gave to Allison Argent as a gift, telling her to look it up if she wants to learn more about her family. It has the Argent family crest on it, a snarling wolf and arrows. Adrian Harris saw Kate wearing it the night they met in a bar. It is the only thing he remembers from her. In the season finale, Sheriff Stilinski discovers it on Kate's dead body, closing the Hale Arson Conspiracy case. This causes the Argents to become pariahs in Beacon Hills.