Geralt's original medallion was destroyed in the book The Tower of the Swallow, but three Witcher medallions were taken from the bounty hunter Leo Bonhart after his death in The Lady of the Lake: a cat medallion claimed by Ciri, a wolf medallion claimed by Geralt, and a griffin medallion claimed by Yennefer.
In The Last Wish, the first book in the series chronologically, Geralt claims that no monster can touch a Witcher's medallion.
