Oval Black Onyx and Diamond Accent Pendant

This item is an elegant oval-shaped pendant featuring a central black onyx cabochon. The onyx is smooth and polished, exhibiting a deep, uniform black color without visible inclusions. Set into the direct center of the onyx is a small diamond accent, likely single-cut or round brilliant, housed within a white-tone starburst or rhomboid-shaped metal setting that provides a sharp contrast against the dark stone. The main body of the pendant is constructed from what appears to be yellow gold, consisting of a double-rimmed oval frame. The outer frame features decorative gold bead or granulation details at the top and bottom poles, enhancing its neoclassical or Victorian-revival aesthetic. A tapered gold bail is attached to the top for suspension from a chain. The craftsmanship suggests a mid-to-late 20th-century origin, likely a piece of fine fashion jewelry. In terms of condition, the gold shows minor surface scratches consistent with light wear, and the onyx appears free of chips or cracks. There are no visible maker's marks or hallmarks in the provided image, though they would typically be located on the bail or the back of the setting. The overall quality is characteristic of solid 10k or 14k gold jewelry.