The kyber pendant of Jyn, a necklace made up of a kyber crystal, was gifted to Jyn Erso by her mother, Lyra Erso. This occurred as they were fleeing from death troopers. A Ryn jeweler, who seemed to be following Lyra, had previously given the necklace to her. Engraved on it in Aurebesh were the words "TRUST IN THE FORCE," which were identical to the words Lyra spoke to her daughter when she presented her with the necklace as a farewell present.
Because the guards did not identify it as a kyber crystal, years later, Jyn still possessed the necklace while she was being held in an Imperial detention center on Wobani.
Ryan Church initially created concept art for a kyber crystal necklace for Star Wars: Episode VII The Force Awakens.