The pendant measures just under approximately 1 inch, or about 26 millimeters, high, including the bale bar, by just over about 7/8 of an inch, or approximately 22.5 millimeters, wide, and roughly 5/16 of an inch thick. (Included is a US Quarter in the photographs, for the measurement-challenged and ruler-averse.) The bale opening measures just over approximately 1/8 of an inch, or about 3.5 millimeters, wide. The pendant is stamped, "925", on the back side, unsigned. Weight is approximately 9.5 grams, which includes the stone weight, of course.
This pendant is in very good vintage condition, but will exhibit the expected light surface scratches and tiny dings to the silver from normal wear. I saw no damage to the stone. Hand polished , but may have some tarnish, especially within the small crevice above the setting and below the bale bar.
A very sleek, bold and beautiful, Sterling silver and black onyx pendant. Nice made, thick and heavy. Simply stylish.