This Sterling Silver and blue enamels ring is in the shape of a pebble. The silver edged ring sits on a smooth D shape shank which measures approx: 2.2mm wide. The blue pebble measures approx: 8mm in length and can be worn individually or as part of a Stack Ring set. Please let me know the ring size you need at Checkout (in the box under Shipping info) or you can message me. Also let me know whether you used a narrow ring sizer (approx 4mm wide) or a wide ring sizer (7mm wide). This ensures a perfect fit.