'Clear as Crystal' in the Bible

In front of the throne was something like a sea of glass as clear as crystal. In the center of the throne and on each side of the throne were four living creatures full of eyes in front and in back.

Having the glory of God: and her light was like unto a stone most precious, even like a jasper stone, clear as crystal;

clear as crystal, Having a wall great and high, having twelve gates, and at the gates twelve angels, and the names written thereon, which are the names of the twelve tribes of the children of Israel: On the east three gates,

The twelve gates are twelve pearls, each gate made of a single pearl; and the streets of the City are pure gold, clear as crystal.

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.