I went to a catholic high school and I had a theology teacher who wore this necklace, I asked him about and he had said it was protect his salvation at the moment of his death (this might be paraphrasing the conversation quite a bit). I don’t know if objects can do this. This might not be related but I’ve heard in some circles where people pass along relics or holy objects, and from what I heard these items can bring you closer to God. I know that Anglicans in the most part, believe that faith is sufficient for salvation. So I guess my question is can these objects hold some short of saving grace, can these things be holy?