This ring belonged to my mother. I believe the stone is an abalone shell. When I was a kid, mom used to let me "play" with her jewelry box. I would take everything out and look at it, try it on and then put it back where I found it. After my mom died, Dad let me have her jewelry since I was her only daughter. When I looked in mom's jewelry box at this ring, the band was broken and mom had put a band-aid around it so she could wear it. I took it to the place that fixes all of my jewelry and got it repaired so I could wear it. I had to have it sized smaller so I could wear it. I estimate this ring is over 50 years old. I wear it everyday.