Octagonal double-sided cufflinks in the Art Deco style

This pair of double-sided cufflinks features an octagonal silhouette with decorative engine-turned engraving (guilloché) and set stones. Each cufflink consists of two octagonal faces connected by a rigid, hallmarked bar link. The front-facing elements are crafted from a light-colored metal, appearing consistent with white gold or platinum-plated silver, decorated with a Greek key border and a central sunburst or floral engine-turned pattern. One face is bezel-set with a faceted blue stone, likely sapphire or a synthetic equivalent, while the corresponding face displays a foliate engraving. The reverse of the faces shows a yellow metal finish, possibly indicating a gold-back construction or gold plating over a base metal. A hallmark is visible on the connecting bar, though it is not clearly legible without magnification; it appears consistent with early 20th-century gold or maker's marks. Stylistically, the geometric shapes and intricate mechanical engraving are consistent with the Art Deco period, likely dating to the 1920s or 1930s. Visible condition includes minor surface scratches, a slight patina on the yellow metal components, and some softening of the engraved details consistent with age and wear. The craftsmanship suggests a mid-to-high-quality production popular in the early 20th century. Hedged language is used as materials and makers cannot be verified without physical testing.

Based on my visual analysis of the provided image, these double-sided cufflinks exhibit stylistic hallmarks consistent with the Art Deco period, likely 1920s or 1930s. I can observe a 'white-on-yellow' construction, which often suggests a platinum or white gold face over a yellow gold backing, or high-quality gold plating. The geometric octagonal silhouette and guilloché engraving are characteristic of mid-to-high-tier gentleman's jewelry from that era. One face bears a blue stone, which I must treat as a hypothesis for sapphire or synthetic spinel; I cannot confirm the material or origin without refractive index testing and microscopic inspection. A hallmark is visible on the bar link, but without high-magnification photography, I can only state it appears consistent with period maker’s marks. The valuation range assumes these are crafted from at least 14k gold with genuine or high-quality synthetic stones. If physical testing reveals the items are silver-topped or base metal with heavy plating, the value would likely decrease to the $150–$250 range. Conversely, if the white metal is confirmed as platinum and the stones as natural sapphires of high clarity, the value could exceed the current estimate. Market demand for Art Deco accessories remains stable, though value is heavily dependent on metal purity and maker identification. To confirm this appraisal, a physical examination is required to verify the hallmarks, perform an acid or XRF metal test, and conduct gemological testing on the blue stones. Until such verification is performed, this estimate remains a professional hypothesis based on the observable craftsmanship and stylistic evidence.