Reminds me of a couple of peddlers that came into my shop one summer afternoon. Forget what they were selling, but I ended up giving away an old CRT television I had stored away, and noticed one of the guys had a stuck ring. Had been stuck a few days and was looking kind of bad. He was in some pain and it looked dangerous to me. His circulation wasn't good in that finger. So I offered to cut it off (not the finger! Well, I did joke about that). It was a nice ring, fairly, so I didn't want to just get my end nippers or carbide tile nippers and mutilate it (the ring), so I had him lay his hand across a mill vice and after clamping the ring gently, took a jewelers saw and split it at about 45°. The kerf was thin, and could be easily soldered back together so he could get it resized. Nothing to it.
Now, you can buy some pretty fancy carbide rings, so the EMT's (you guys feel free to chime in) had to adapt methods to crack them, unlike the standard ring cutters they usually carried. I always thought a pair of vise-grips properly adjusted would do the job with low risk to the finger, but what do I know?. I don't wear jewelry any more. Sometimes a wristwatch, but even that has a stretch band instead of a clasp, and never while working the machines. It lays on the desk.