He measured its wall and it was 144 cubits thick, by man's measurement, which the angel was using. The wall was made of Jasper, and the city of pure gold, as pure as glass. The foundations of the city walls were decorated with every kind of precious stone. The twelve gates were twelve pearls, each gate made of a single pearls, each gate made of a single pearl. The great street of the city was of pure gold, like transparent glass.
Pearls represent beauty through suffering.
I did not see a temple in the city, because the Lord God Almighty and the Lamb are its temple. The temple is gone because God's dealing with sin is over. After the destruction of evil God's people spread out on the new earth as the nations and kingdoms of the saved. The city does not need the sun or the moon to shine on it, for the glory of God gives it light, and the Lamb is its lamp. The nations will walk by its light, and the kings of the earth will bring their splendor into it.