I didn’t know that about chlorine. Good to know, thanks! I didn’t realize how much my fingers have gotten bigger over the years until this pandemic. I usually wear my 10th anniversary ring instead of my engagement ring on my left hand ring finger. Since I’ve been working from home and haven’t worn my ring for a long period of time, when I went to put it on it was super tight. I think the part of my finger where it cinched from regular wear has relaxed. (I refused to think I’ve gained weight during the lockdown.I get my rings sized very tight so that when I tug on them they don't come off. SA's would complain that I get my rings sized too tight. When I was 7, I lost a ring (fortunately it was fashion jewelry, nothing valuable) when I tore off my gloves (winter). Still traumatized about that. Plus, when I lose weight some comes off my fingers. ARGGGH! so one way or the other I size and resize rings. If I have a hard time getting a ring off I wet my fingers.
I keep my rings on when washing hands. Never take them off and put them on the sink when I'm out and about. If they get a soap film I spray the ring with windex (and rinse, of course).
Don't wear rings when you're swimming. Chlorine can eat away gold, not like swiss cheese, but still. Your instinct is right: it's not supposed to be a good idea to wear jewelry when sleeping. I guess the bedding rubs against the metai.

Years ago my GF told me about how her co-worker took off her new engagement ring in the restroom at their office building to wash her hands. She forgot and left it in the restroom. When she got back to her desk she realized it and ran back but it was already gone. Since hearing this story I never took off my ring in the public restrooms.
I too lost a ring when I was about 6-7. My mom gave me this very pretty fresh pearl ring with 2 teeny tiny gem stones and when I washed my hands it went down the drain. I’m still traumatized over it.
