My engagement ring was my mother's and she was amazingly generous and decided to give it to Mr. Onion to give to me! She started to get arthritis so she couldn't get the ring over her knuckle without the ring being so large that it spun around on her finger. Her jeweler installed the Finger Mate on her ring and solved her problem. The amazing thing is I was able to slip the ring on perfectly with no resizing and HOORAY, it doesn't spin around!! And I'm all set when I get older and have the same problem my mother did.

My engagement ring "locked"

To open the locking mechanism you simply pull up on the stone. It sounds scary but it doesn't hurt the ring one bit

The lock mechanism open

And another shot of the mechanism open
Click to enlarge any of the photos
I'd highly recommend you look into this if you thought there was no other way and you just had to live with your ring spinning. I love it and am so glad that I have a built in long term solution for old age because I plan to live to be very old and very happily married with this ring on my hand!