Lady’s large oval cameo dress ring.  Cameo measures 3/4" x ½”.  Ring interior diameter is 16.0 mm, size 5 - 5.5.   The ring is set in 9ct yellow gold. which is a recognized standard in the United Kingdom.   British hallmarks appear to read C G & S   9, .375, anchor, P .  If the reading is accurate, the ring may be attributed to Charles Green & Son of Birmingham, England.  All information is to best knowledge and belief.   $195.