"Art Deco Ring In Onyx Gold And Diamond"
A pretty retro ring, made around 1930. Made in 18 carat white gold, set with onyx and a rose-cut diamond of around 0.30 carat. Hallmark for 750 gold. Maker's mark: unknown. The dimension of the front is 21*15mm. Ring size: 52.5 or 6.25 USA.