Chinese abacus ring. Qing Dynasty; estimated to be around 300 years old. I'm not really a jewelry wearing guy, but I'd be willing to make an exception. :cool:
https://s3-us-west-1.amazonaws.com/h...bacus_ring.jpg
Previously:
https://www.homemadetools.net/forum/...4709#post80410
https://www.homemadetools.net/forum/...2930#post97555