Measures 1 inch wide. A keystone is the center stone that holds the archway firm and unmovable. There are several keystones found on temples (e.g. Salt Lake Temple). The upside-down five pointed star represents the morning star. Both the Keystone and Star represent Jesus Christ. This is a great conversation piece and a beautiful collector's item. This pin has a nail and military clutch back to put on your suit lapel or tie.