Very interesting 10 karat yellow gold flip ring that features a fabulous oval shell cameo and you flip it over and it has an oval onyx with a small diamond set in the center. The cameo measures 16x8mm and the onyx is 17x9mm. The measurements of the ring is 26x20mm, it fits a 7 1/4 finger, and it weighs 2.5 dwt. The ring dates from the 1940's. The metal content is unmarked and has been tested using an electronic tester.