Brutalist Modernist Sterling Silver and Faceted Aquamarine/Blue Glass Ring

This is a substantial modernist or Brutalist style ring featuring a large, horizontally oriented rectangular gemstone, likely a pale blue aquamarine, blue topaz, or high-quality faceted glass. The stone is set in a heavy, sculptural silver mounting characterized by organic, flowing curves that form a crown-like bridge over the stone. The metal appears to be sterling silver, indicated by the specific greyish color and the presence of dark tarnish or patina in the recessed areas. The craftsmanship suggests a mid-century to late 20th-century artisan piece (circa 1960s-1970s). The stone's cut is a unique custom step-cut with geometric pavilion faceting visible through the crown. Regarding condition, there is visible heavy oxidation and tarnish throughout the silver setting, along with a notable small orange/brown inclusion or surface deposit on the far left edge of the stone. The metal surface shows minor surface scratches consistent with age and wear, but the overall structural integrity of the heavy-gauge mounting remains intact. No obvious maker's marks are visible from this angle, but the piece displays high-quality hand-fabricated characteristics.