Art Deco diamond and sapphire ring

This is an intricate, elongated cocktail ring featuring a classic navette or marquise-shaped face, crafted in white metal that is consistent with platinum or white gold typical of the early 20th century. The physical construction showcases milgrain detailing along the bezels and geometric edges, with openwork filigree and pierced metalwork characteristic of the period. The central vertical axis houses three prominent old-mine or old-European cut diamonds set in a stepped row, surrounded by a channel-set border of dark blue calibré-cut sapphires that trace the inner marquise contour. An outer halo and shoulders are pavé-set with numerous smaller round diamonds, creating substantial sparkle and a high-contrast palette of colorless stones against the deep blue sapphires and reflective white metal. There are no maker's marks or stamps directly legible from this angle, and the overall identification rests solely on the stylistic hallmarks of the Art Deco period, including the geometric symmetry, milgrain work, and stone cuts. The piece shows minor surface wear consistent with age, but appears structurally sound. This item remains unauthenticated and unverified regarding the exact metal purity, stone carat weights, or specific maker, and should be evaluated in person by a qualified gemologist to confirm material composition and gemological grading.

Based on what I can see in the photograph, this piece exhibits stylistic hallmarks strongly associated with the Art Deco era, including a classic navette silhouette, openwork pierced metalwork, milgrain detailing, and a channel of calibré-cut sapphires framing three central old-cut diamonds. The white metal has the appearance of platinum or high-karat white gold, which is typical for the period. However, I cannot verify from a photo the metal fineness, whether the sapphires are natural or synthetic (common in period pieces), or the exact carat weights and color/clarity grades of the diamonds. There are no clearly visible maker's marks or hallmarks in the provided view. My valuation range of $3,500 to $5,500 reflects the secondary market value for an item of this type assuming the attribution to the Art Deco period is correct and that it is constructed from platinum or gold with natural diamonds. Current market demand for antique Art Deco cocktail rings remains robust, with strong collector interest in geometric designs featuring contrasting sapphires. To confirm this evaluation, an in-person examination by a qualified gemologist or antique jewelry specialist would be required. This would include testing the metal purity, microscopic examination of the stone facets to detect modern versus antique cuts, and gemological testing to determine sapphire origin. If hands-on testing reveals this to be a modern reproduction, an 'in the style of' vintage piece, or crafted from silver and paste/synthetic stones, the fair market value would drop considerably, likely falling into the $300 to $800 range.