I'm not sure how you would retrieve the necklace once it is insie of your body. wouldn't it just make more sense to have it be just a normal necklace? Well as normal as imperial arms goes. 

Also if you don't want to share how your family came across this imperial arms with the guys in the rp at the moment would you mind sending me a private message? It seems a bit odd to just have some no name village have an imperial arms lying around.