The ring is approximately a size 6. The face measures just over approximately 3/16 of an inch, or about 4.9 millimeters, high. The onyx measures about 1/4 of an inch wide. The band narrows slightly in back to about 3/16 of an inch, or approximately 4.76 millimeters, wide. (Included find a US Quarter in the photographs, for the measurement-challenged and ruler-averse.) It is marked inside, "925", unsigned. Weight is approximately 5.9 grams, which includes the stone weight, of course.
This is a new old stock ring, never sold or worn, but vintage from the 1980's. There may be light surface scratches to the silver from years of storage. Hand polished, but there may still be areas of missed tarnish. The ring shown is a representative example. The onyx is intact and appears undamaged.
A very pretty, simple and sleek vintage Sterling silver and black onyx ring. Well-constructed, with a lot of modern style.