Samantha is Earthbound - S8-E16
Other mistake: This episode is a repeat of Season 4 No Zip in My Zap with the better Darrin 1. Since Samantha previously became earthbound for not practicing her normal, day to day, witchcraft. They would know why Sam is again earthbound. And, Samantha constantly uses her witchcraft.
Answer: The original diamond and white gold heart necklace was given to Elizabeth Montgomery by her then real-life husband, William Asher, who also directed the show. She wore it in nearly every early episode. When the necklace was lost or stolen about mid-way through the series, Montgomery had two replicas made from rhinestones. She wore either one of those for the rest of the show's run.
raywest ★