Words of Wisdom
Having the glory of God: and her light was like unto a stone most precious, even like a jasper stone, clear as crystal;
And had a wall great and high, and had twelve gates, and at the gates twelve angels, and names written thereon, which are the names of the twelve tribes of the children of Israel:
On the east three gates; on the north three gates; on the south three gates; and on the west three gates.
Revelation 21:11-13
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. Revelation 22:1