Vintage 10K Gold Black Onyx and Diamond Ring

This item is a vintage-style ring, likely a signet or statement ring, crafted from gold, indicated by the '10k' context provided, suggesting it's 10 karat gold. Its primary feature is a central oval-shaped inlay of polished black onyx or a similar dark stone, set flush within the gold. Located centrally on the black inlay is a single, clear, brilliant-cut diamond, approximately 2-3mm in diameter, set in a bezel or partial bezel setting, providing a striking contrast against the dark background. The gold band around the central inlay is intricately decorated with geometric patterns and stylized starburst motifs, which are cut out or engraved into the metal, allowing light to pass through and enhancing its visual appeal. There are visible signs of wear consistent with age and use, including minor surface scratches on the gold and potentially some slight dulling of the black inlay, though it retains its overall polished appearance. The craftsmanship appears to be of good quality, with precise details in the decorative elements. The setting of the diamond seems secure. The design suggests an Art Deco or Mid-Century Modern aesthetic, placing its estimated age from the 1920s to the 1960s. The ring has a substantial, domed profile, indicative of a men's ring or a bold statement piece for women. No specific maker's marks are discernible from the image.