Gold Ring with Emerald-Cut Dark Gemstone

The item is a gold-toned ring featuring a prominent, centrally-set, emerald-cut gemstone. The gemstone exhibits a very dark hue, possibly a deep purple, black, or blue, which could suggest materials such as amethyst, black onyx, sapphire, or even a very dark garnet, though positive identification is not possible from the image alone. Its cut presents a rectangular facet pattern, typical of an emerald cut, maximizing light return and showing off the stone's depth. The stone is securely set within a bezel or prong-like setting that closely frames its perimeter. The ring's band is of a notable design, featuring multiple ribbed or fluted parallel lines that extend from the gemstone setting down the shoulders of the ring, creating a textured and somewhat architectural appearance before transitioning into a simpler, smooth band towards the back. The metal appears to be polished yellow gold or a similar gold-toned alloy, exhibiting a warm luster. There are no visible manufacturer's marks or signatures, but the overall design suggests a contemporary or mid-20th century aesthetic. The condition appears to be good with no obvious major damage, chips to the stone, or heavy scratching on the metal, judging from the limited resolution. The craftsmanship seems solid, with the gemstone well-seated and the fluting evenly executed, indicating a standard level of jewelry production.