The ring is approximately a size 7 and 1/2. The band measures just over approximately 3/8 of an inch, or about 10 millimeters, high, by just over about 1/16 of an inch, or approximately 2 millimeters, thick. The oval onyx setting measures about 5/16 of an inch, or approximately 7.9375 millimeters, wide, by just over approximately 1/4 of an inch, or about 6.5 millimeters, high. (Included you'll find a US Quarter in the photographs, for the measurement-challenged and ruler-averse.) It is marked inside, "925", unsigned. Weight is approximately 6.8 grams, which includes the stone weight, of course.
This is a vintage ring, which has been worn and enjoyed. There will be the expected surface scratches and tiny dings in the silver from normal wear. No visible damage to the stone. The ring band is slightly flattened at the back, visible in the photos; Probably not significant enough to affect the fit. Hand polished, but there will still areas of missed tarnish, in addition to that left behind intentionally.
A very pretty, boldly sized but delicately styled, vintage Sterling silver and black onyx open scroll ring. Great detail and a strong profile.