brutalist cuff ring 3d model

Design a brutalist cuff-style ring made from 925 sterling silver with a strictly symmetrical geometry along its central vertical axis. The ring is architectural and monolithic, defined by flat planes, sharp edges, and precise chamfers. The top surface is a flat rectangular plane with subtle bevels on the front and back, creating a faceted, block-like silhouette. The side walls are straight and vertical, identical on both sides to ensure perfect symmetry. The ring is open at the bottom in a cuff form, but the inner opening for the finger is a perfectly round, continuous circle, with an inner diameter of approximately 18.7 mm. The inner surface is smooth and uniform for comfort and must remain geometrically exact, without faceting or distortion. Compared to the previous version, the lower outer edges of the ring are more sharply defined, featuring crisp angular transitions on both sides of the opening. These sharp lower edges are symmetrical left to right and contrast clearly with the smooth circular inner ho