The most mesmerising antique ring ..
Solid 18ct Yellow Gold featuring a deep black oval onyx with a lovely central diamond in a white metal (possibly platinum) . Hand etched all the way around the outside of the onyx! 
PLEASE NOTE: there is a small chip in the onyx which I have tried to photograph well. It's not too noticeable in most lights - the price reflects this. 
Total Ring Head approx :  17.5mm 
Onyx is approx 12.5mm 
Diamond Approx 2.75mm
Weight: 4.6g 
The ring is slightly oval in shape - Size M/ M.25