Black Beauty is a 10 karat Yellow Gold Black Onyx and Diamond Art Deco Ring. A large 20 mm x 4.5 mm oval Black Onyx stone is bezel and prong set in this Yellow Gold mounting. A tiny .01 carat Diamond is prong and bezel set in an angled square White Gold mounting. Size 6 1/4″. Hallmarked “10K”. Circa 1930’s.