Oval cocktail ring in the Victorian-revival style

This item appears to be a large, decorative cocktail ring. It features a central oval cabochon with distinct reddish-brown and dark brown horizontal striations, which is stylistically consistent with tiger's eye or a striped agate-type gemstone. The stone is set within an ornate, silver-toned metal mounting characterized by heavy open-work filigree and scrollwork motifs. This elaborate metalwork is consistent with jewelry from the Victorian-revival period, likely dating from the mid-20th century. The ring shows visible signs of age and wear, including tarnishing and a dark patina settling into the recessed areas of the filigree, along with some slight discoloration or plating wear on the band itself. The construction appears to be cast metal rather than handcrafted wirework, suggesting a mass-produced fashion or costume jewelry origin. No maker's marks, signatures, or metal purity hallmarks (such as '925' or 'Sterling') are visible in the image, so the material composition of the metal and the identification of the stone remain unverified hypotheses. The identification is based purely on visual stylistic features and common costume jewelry manufacturing techniques seen in the 1950s through 1970s.

Based on my visual examination of the provided image, I have assessed this cocktail ring as a piece of mid-20th-century Victorian-revival costume jewelry. The central stone exhibits characteristics consistent with a tiger's eye or striped agate cabochon, though I cannot determine if it is a natural mineral or a synthetic simulant without a physical examination. The elaborate open-work filigree mounting displays a dark patina and surface wear that I suspect indicates a silver-plated base metal rather than solid sterling silver, particularly as no hallmarks like '925' are visible. This type of cast construction suggests mass-produced fashion jewelry from the 1950s-1970s. The value estimate is based on the hypothesis that this is an unattributed costume piece in fair-to-good vintage condition. In the current secondary market, there is a steady demand for 'statement' Victorian-revival rings, though values remain modest for non-precious metals. Because I cannot verify the metal purity or stone authenticity from a photo, this estimate assumes the materials are non-precious; should physical testing reveal the setting is solid sterling silver or the stone is a high-grade natural specimen, the value could increase to the $125-$175 range. Conversely, if the 'stone' is determined to be molded resin or plastic, the value would likely fall below $20. To provide a more precise valuation, an in-person inspection would be required to test metal acid-reactivity, observe the stone under magnification for natural inclusions, and search for faint maker's marks that may be obscured by the heavy patina.