RENTON, June 13 -- Press the little 12 Flag on the side of the Seattle Seahawks' new Super Bowl ring and something happens that no championship ring has done before. The Lumen Field arches set across the top spring outward on a hinge, and underneath them, hidden until that moment, are two words: WORLD CHAMPIONS. It is the kind of mechanical flourish that turns a piece of jewelry into a magic trick, and it is the reason a hardened rapper and a Hollywood action star both lost their composure on camera.

The Seahawks handed the rings to players, coaches and football staff at a private ceremony, capping the championship season with a piece of hardware that is, by the jeweler's claim, the largest Super Bowl ring ever made. Open the side panels...