This is a modernist vintage sterling ring by Kaunis Koru. It is marked 925 and has the back to back KK logo. It has a wonderful abstract design that is like mini-sculpture for your fingers. The ring is nicer than pictured and measures about 1 x 1 inches at face and is currently at size 8 but can be sized down to 7.5 or up to 8.5 as back shank is open.