Late Art Deco Transitional Solitaire Diamond Ring

This is a vintage solitaire diamond ring likely dating from the 1930s to early 1940s, a period transitioning from Art Deco to Early Retro styles. The ring features a two-tone construction common for this era, consisting of a yellow gold shank and an ornate, possibly white gold or platinum-topped, illusion-style octagonal setting. The central gemstone is a round brilliant-cut or Old European-cut diamond, securely held by multiple prongs within a geometric, faceted white metal plate designed to make the stone appear larger. The shoulders of the ring exhibit intricate openwork filigree and milgrain detailing, including small triangular motifs and pierced elements characteristic of high-quality craftsmanship from the early 20th century. The gold finish shows a warm patina indicative of age and historical wear. Visible condition issues include some smoothing of the fine detail on the outer edges and shank, consistent with decades of use. The setting appears structurally sound, though a professional jeweler should verify the security of the prongs. The complexity of the piercing and the mixed-metal aesthetic suggest it was a piece of significant quality for its time, likely manufactured during the 'Great Depression' era where such 'illusion' settings gained widespread popularity.