Art Deco Diamond and Emerald Geometric Cocktail Ring

This is a fine example of an Art Deco cocktail ring, dating to circa 1930. The piece features a prominent central old European cut diamond, estimated at approximately 1.00 to 1.25 carats, securely held in a square bezel setting. This central stone is framed by a vibrant halo of channel-set calibré-cut green emeralds, adding a striking color contrast characteristic of the period. The outer border consists of a frame of small, bead-set single-cut diamonds, finished with delicate milgrain detailing on the platinum or high-karat white gold mounting. The geometric, square-head design is a hallmark of the 1930s 'Art Moderne' influence within the Art Deco movement. The construction shows high-quality benchwork, particularly in the precision of the emerald settings. Visible condition appears good for its age, though there is minor surface wear and slight flea bites visible on the crown facets of the emeralds, which is common for softer colored gemstones of this era. The metal shows a soft patina indicative of long-term wear. No visible maker's marks are discernible from the top view, but the craftsmanship suggests a professional high-end jewelry house of the early 20th century.