Then I looked, and, behold, in the firmament that was above the head of the cherubim there appeared over them as it were a sapphire stone, as the appearance of the likeness of a throne.
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George Leo Haydock
AD 1849
Throne. It was a sky blue crystal or sapphire colour, (chap. i. 22, 26.) and was now empty, chap. i. The Lord spoke from the temple door, ver. 4. (Haydock)