This necklace belonged to Amren before she gave it to Feyre Archeron.
History[]
When Feyre and Rhysand were going to go to the Prison to speak with the Bone Carver, Amren lent her a Feyre necklace and told her that it had helped her out of the Prison, that he would also help her, and she warned her that if she did not return it, it would end badly for her.
Feyre wore it the day she went to the Prison and when she returned it to her, she was surprised and told her that she could keep it since it had no magic, that it had been a gift from Rhysand two hundred years ago and that she had found it at the bottom of a drawer. She had lied to her as she thought Feyre needed to believe that she could get out of the Prison.