18ct gold opal & diamond halo antique ring - hallmarks 189818ct gold opal and diamond halo antique ring opal cabochon round apx mm 6 rose cut diamond sourced from Birmingham size 7. 25 #09818 Ring can be resized within reason by our local jeweler or likely yours. Please contact us prior to purchasing if you are interested in our jeweler's resizing services. All sales are final. More photos & videos available upon request. We reserve the right to cancel an item listing if it sells elsewhere before it is