Emerald-Cut Black Onyx or Tourmaline Silver Ring

This item is a statement ring featuring a large, rectangular emerald-cut gemstone, likely black onyx, obsidian, or black tourmaline, set in a silver-toned metal mount. The gemstone is held securely by four rounded prongs at each corner. The shoulders of the ring exhibit a distinctive 'triple-ribbed' or gadrooned architectural design, which adds a substantial, masculine, or bold aesthetic to the piece. The metal appears to be sterling silver based on the soft luster and visible greyish patina, though no hallmarks are visible in the current view. Physically, the ring shows signs of moderate wear, characterized by numerous fine surface scratches on the metal and a slightly dulled finish, suggesting regular use. The gemstone surface appears relatively intact, though the high-contrast lighting makes it difficult to detect minor facet-edge abrasions common in softer stones like onyx. The craftsmanship indicates a commercial or mid-century modern influence, possibly dating from the late 20th century. The heavy setting and dark monochromatic color palette suggest a piece designed for durability and a sophisticated, minimalist style.