The Netflix series deviated from the video games in this aspect. While the medallion still exists, there's more focus put on the different symbols that are associated with the series' main characters.

There are three symbols attached to the different characters: a wolf for Geralt, a Zireael (presenting as a swallow) for Ciri, and an Obsidian Star for Yennefer.

For Ciri, the Zireael is a sword that was forged by gnomes in Tir Tochair, which was later presented to her as a gift. She was then forced to use this sword in battle, where she inevitably killed Bonhart. After the battle, Ciri keeps three medallions from the slain Bonhart, but the one she keeps in the book is a cat. It's likely the Zireael is represented as a swallow in the Netflix series because it better represents her character arc.

Yennefer's medallion, featuring the Obsidian Star, has a less clear significance to her. In the games, she is consistently seen with this medallion though, leading some to believe that her magic is tied to it, or it has some other significance to her.

The white wolf symbol that is associated with Geralt, though, closely resembles the white wolf that's on the medallion around his neck. It is a reoccurring symbol in the franchise that they continued to associate with the series' main character.