For your consideration is this nice antique onyx pin. Circa 1880s with the extended pin back and tube hinge known for the era. The pin consists of an onyx oval and kite shaped dangle drop both set is a nicely toothed setting. Very attractive and well made. I believe the pin is rolled gold as you can see by a close up where it has some wear.
The piece measures 1 and 3/4 inches by 1 inch not including the extended pin back.
This is in great condition considering its age. The pin back is functional but has bending. The onyx has some face scratches. These are hard to capture and not visible at most angles but I made a point of taking it at a side angle where it is visible. See last picture.