Revelation 4:6
And before the throne was something like a sea of glass, as clear as crystal. In the center, around the throne, were four living creatures, covered with eyes in front and back.

Revelation 21:11
shining with the glory of God. Its radiance was like a most precious jewel, like a jasper stone, clear as crystal.

Revelation 21:21
And the twelve gates were twelve pearls, with each gate consisting of a single pearl. The main street of the city was pure gold, as pure as transparent glass.