Art Deco marquise cocktail ring

This piece is a decorative cocktail ring featuring an elongated marquise-shaped or navette-shaped profile with a prominent blue center stone. The setting appears to be constructed from a silvery metal, likely white gold, platinum, or a silver alloy, showcasing intricate hand-carved or engraved geometric details along the shoulders and bezel. Surrounding the deep blue central gemstone are elaborate milgrain accents and stepped shoulders, which are common design characteristics consistent with the Art Deco aesthetic of the 1920s to 1930s. The central blue stone is cut in a matching marquise shape with step-cut or faceted pavilion lines, displaying a vibrant royal blue hue, though its material composition as a natural sapphire, synthetic spinel, or colored glass remains unverified from the visual evidence alone. There are no visible hallmarks, maker's marks, or stamps discernible in the photograph. The physical condition exhibits some minor surface wear and a natural patina on the metal mounting, which aligns with age and handling. Craftsmanship indicators include precise engraving and delicate metalwork, suggesting mid-to-high tier period production, though authentication and precise material analysis require physical inspection.

Based on what I can see in the photograph, this decorative cocktail ring exhibits characteristic Art Deco styling from the 1920s to 1930s, featuring an elongated marquise profile, intricate hand-carved geometric details, milgrain accents, and stepped shoulders. The silvery metal mounting appears consistent with white gold or platinum, and the vibrant royal blue center stone is cut in a matching marquise shape. However, I can't verify from a photo alone whether the central stone is a natural sapphire, synthetic spinel, or colored glass, nor can I confirm the exact metal alloy without testing. There are no visible hallmarks or maker's marks discernible in the visual evidence. Assuming this is a period-authentic Art Deco piece, comparable rings of this type and craftsmanship typically command a market value in the $1,200 to $1,800 range, driven by steady demand for vintage geometric jewelry. That said, this valuation is conditional and strictly represents a hypothesis based on visual attributes. If physical inspection reveals the piece to be a modern reproduction, replica, or crafted 'in the style of' the period with synthetic or lower-grade materials, the value would likely decrease significantly, falling closer to $300 - $500. To confirm authenticity, material composition, and precise value, I would need physical inspection, hallmark verification, and scientific testing.