[gchappel]

If it is stuck at the knuckle- try the above and good luck.
If it is stuck due to the swelling take a long thin piece of string or thread- monofilament works as well. Double it up and slowly wrap it- pretty tight- from the finger tip down- tight enough to compress the finger. As you get down to the ring, pass the two ends under the ring. Then try wiggling it off.
I have heard of this working.
Good luck. If all else fails most rings can be repaired after being cut with a ring cutter.
Gary