Grace's medallion

Grace's medallion is a cat's eye ruby embedded within a circular silver pendant. It was originally in Messire's possession. Blanc had somehow obtained this medallion and gave it to Grace when she promised to become a claymore and kill him. The medallion is special and is one of Grace's unique identifiers as no other claymore wears jewelry. The medallion seems to have special properties inside Grace's inner world, acting as an ultimate defense shielding her from powerful attacks by Omen.