Onyx stone white gold ring with diamonds

18 K rhodium-plated white gold ring in a basket clawed setting with 1 onyx and with 1 old-cut diamond in the middle of the gold-plated setting (approx. 0.05 ct. old-cut 2; TCr; VVs2). Marked: Hungarian gold hallmark with a 750 fineness used since 2016. Gross: 3.8 grams. Ring size: 54