Who doesn't want a little octopus on their finger? 

No idea how old this cephalopod is, but I've had it since I was in my teens and I'm now 60, so it's at least forty years old. 

The face of the ring is 17mm (about 5/8") tall.  The band is 3.3mm wide and 1.3mm thick.

The inside of the band is stamped "925."  No maker's mark.

Size 8 - can be resized.

4.9 grams.