"One of the beautiful symbolisms given us in the book of Revelation is this one of the holy city "coming down from God out of heaven." When John said that this city comes down from God out of heaven, he wasn’t talking about coming down past Mercury, Jupiter, and Mars. He meant not that it would settle down over the mount of Olives or any other geographical location. In the Bible a city represents a government, and the "holy" city is a righteous government. It is not a man-made government. It doesn’t have a "Democratic," "Republican," "Reform," "Labor," or "Conservative" party. It emanates from God, out of the celestial or spiritual realm, that is, out of the heavens of the Spirit of God, and is established on earth through a heavenly, spiritual people. We often think with such carnal minds! We hear of a city "coming down from heaven" and imagine it appearing one night in the sky. Jesus once asked the Pharisees whether John the Baptist’s baptism was "from heaven" or from men. With the same carnal reasoning we could picture John’s baptism somehow mystically floating down through the sky and landing in the Jordan River! Of course, that’s not what Jesus meant. When He spoke of John’s baptism being "from heaven" He was simply asking whether it originated with God, or whether it originated with men. May the blessed spirit of revelation grant us the clarity to see that this city shall never rule until it has in all truth become the "holy" city, prepared, adorned, and "made ready." Oh, yes, she is being prepared and being adorned."
Much more in the link:
https://www.godfire.net/eby/Rev/rev242.html
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"To look upon Him who sits on the throne is like looking at a dazzling jasper stone. To look upon the light that emanates from the city of God is like looking at a dazzling jasper stone. The light, the splendor, the majesty, the beauty, the glory of Him who sits on the throne is like a jasper stone. The light, the splendor, the majesty, the beauty, the glory of the city of God is like a jasper stone. It is the same light, for "her light" is identified by John when he says, "And the city had no need of the sun, neither of the moon, to shine in it: for the glory of God did lighten it, and the Lamb is the light thereof" (Rev. 21:23). Therefore — HIS LIGHT is HER LIGHT! When I look at Jesus I see a life, a nature, a truth, a ministry that is clear as crystal. When I look at God’s called and chosen elect I am beginning to see the same thing! The message is clear — the Lord Jesus Christ is the jasper stone! The truth and the life that He is, is as clear as crystal! He is described as a stone most precious. That is the glory of our Lord Jesus the Christ! But now John sees something else — he sees a whole city, a great city, a beautiful city, invested upon with all the scintillating brilliance of the jasper stone — the glory of God revealed in Jesus now is given to the saints of the Most High!"