'Crystal clear' in the Bible

And there was an ocean, as crystal-clear as glass, in front of the throne. And at the center, surrounding the throne were four living beings, covered with eyes in the front and back of them. [Note: In view of Isa. 6:1-3 and especially Eze. 10:20ff, these "living beings" appear to be some special order of heavenly beings who inhabit the presence of God].

having the glory of God. Her brilliance was like a very costly stone, as a stone of crystal-clear jasper.

Then the angel [See 21:9] showed me the river of the water of life. It was crystal-clear as it flowed out of the throne of God and the Lamb,