Emerald-Cut Aquamarine and Diamond Cocktail Ring

This is a statement cocktail ring featuring a large, emerald-cut light blue gemstone, likely aquamarine or blue topaz, estimated to be between 10-15 carats. The center stone is held in place by a four-prong setting on a white metal band, which appears to be white gold, platinum, or sterling silver. The ring is flanked by two rectangular shoulders, each set with three small, round-cut accent stones, possibly diamonds or white sapphires. The main stone exhibits a clear, vitreous luster with some visible internal inclusions or striations, characteristic of natural rectangular-step emerald cuts. The setting style suggests a mid-20th-century aesthetic, possibly Retro or early Modernist period (circa 1950s-1970s). The metal shows slight surface abrasions and signs of wear consistent with age, particularly along the band's outer shank. The prongs appear secure, though they exhibit a rounded, slightly bulbous finish typical of larger stones meant for occasional formal wear. There are no clear maker's marks or hallmarks visible in the image to confirm the precious metal content or manufacturer. The overall craftsmanship is indicative of fine jewelry design focused on emphasizing the scale and color of the central gemstone.