Jamieson, Fausset & Brown

windows--rather, "battlements"; literally, "suns"; applied to battlements from their radiated appearance. agates--rather, "rubies." carbuncles--literally, "sparkling gems"; the carbuncle when held to the sun becomes like a burning coal. all thy borders--rather, "thy whole circuit," consisting of precious stones. The glory of the Church on earth, when the Hebrew Church, according to the original design, shall be the metropolis of Christendom.