A butterbeer cork necklace was a necklace that had a Butterbeer cork as a pendant. It was believed to keep Nargles away. Luna Lovegood wore this necklace during her school days at Hogwarts School of Witchcraft and Wizardry. Many other students found this odd. Philbert Chivers owned one of these necklaces, but exchanged it with Humphrey Balsamo at Slug & Jiggers Apothecary for some potions he believed to be narglecide.