Revelation 21:18
And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass.
Revelation 21:21
And the twelve gates were twelve pearls; every several gate was of one pearl: and the street of the city was pure gold, as it were transparent glass.
Revelation 22:1
And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.