It’s been a while since I quoted one of these tips from days gone by, so here ya go 🙂 :
Rings loosened from the finger
If a gold ring sticks tight on the finger, and cannot easily be removed, touch it with mercury, and it will become so brittle that a single blow will break it.
The Housekeeper’s Receipt Book, 1813
Sounds extreme and a waste of Gold but there are probably circumstances where it’d be or feel necessary.