Revised description: I don't usually sell my antique boxes but as I bought this in its own box, I am including it. The brooch is beautiful and in lovely condition. I had it listed as Victorian but as told it is most likely Georgian. Onyx circle within 18k gold ring with what seems to be tiny freshwater pearls in a cluster.The jeweler I bought it from assured me it is 18k but I can't find a mark, perhaps too early. I stand by what I sell. Just adorable and outside size measures 1 1/2 inches with the "C" clasp. This would be fabulous as a pendant if your jeweler could add a ring!