E. , yeah, that looks like a good one too from the photos... Maybe the edge was a comfort type thing for wearing [?]
I had a ring that got tight [really I got fat
] and I didn't want to enlarge the ring and the jeweler did something like that to the top,,and the bottom for comfort..
still really E.,,it would be nice to see what Don says.. I maybe wouldn't 'paper' the ring but I'd ask him if he's seen a few like that.. It will help if you want to sell,,,every bit helps when its time to sell!