Pre-owned. From an estate. The ring is broken on one side as shown. A jeweler will have to fix that. Currently, if it is held together, the ring is a size 8.5. Shank is a bit out-of-round. The monogram, which I believe to be either "CB" or "GB", has a small diamond over it. The onyx piece measures 7/16" x 3/8". The ring weighs 3.4 grams. It is stamped "10k" and  "R&B" . Scratches and fleabites to the onyx. Ring could use a polishing.