Vintage Filigree Diamond Engagement Ring

This is a vintage ladies' engagement ring, likely dating from the Art Deco period (circa 1920s-1930s). The ring is crafted in a white metal, most commonly 14k or 18k white gold or platinum for this era, featuring intricate hand-pierced filigree work along the shoulders and gallery. At the center sits a single round brilliant or transitional cut diamond, estimated to be approximately 0.25 to 0.40 carats. The diamond is held in a secure hex-style or octagonal illusion setting, designed to make the stone appear larger and more square in silhouette, a hallmark of the period's geometric aesthetic. The filigree features delicate floral or scrolling lace-like patterns. Regarding condition, the metal shows soft wear consistent with age, with some slight smoothing of the fine milgrain edging and filigree details. There are no obvious signs of major repair or resizing visible from the primary angle, though a hallmark or maker's mark likely exists on the inner shank. The craftsmanship reflects the high-quality die-struck or hand-finished production of early 20th-century American jewelry. The stone appears clear with good fire, though a macroscopic professional cleaning and prong inspection are recommended to ensure long-term stability and brilliance.