The listing, Old Sterling Hallmarked Ring with 'Diamonds' All the Way Around has ended.
I can't tell you the makers. It has the word "Sterling" stamped on it, then a sideways triangle, then the "&" sign, then another sideways triangle pointing the opposite way. It looks like both triangles have a "C" in the middle of them, but I'm not sure. As you can see it has 'diamonds' all the way around. They are tiny squares and faceted on the sides. They all look original, and none of them appear to be missing. I was told by one jeweler they weren't real diamonds. The ring is closed on the back. It appears from a paper sizing chart to be a size 8. U.S. shipping only.