Its odd that you should mention about the body's effect on watches and jewellery,
My father has been in the jewelery business since the 40's and he has seen time and again how the body affects people who wear watches. They don't work on them. Then he will wear the watch himself for a few days and away it goes. So he gives the watch back to them and the watch stops working again.
It is really crazy.
Same with jewelery,it may turn someone's finger green and with someone else there is not a problem.
Maybe it has something to do with the metal toxicity in people's bodies.
I have seen alot strange things over the years having to do with jewelery and watches.
Watches running backwards on people. the next person who wears it may not have a problem.