Revelation 4:6
and in front of the throne is what seemed to be a sea of glass, 'resembling crystal, while within the space before the throne and round the throne are four Creatures full of eyes' in front and behind.
Revelation 4:3
He who was seated on it was in appearance like a jasper and a sardius; and 'round the throne there was a rainbow' of the color of an emerald.
Revelation 21:11
Its brilliance was like that of some very precious stone, like a jasper, transparent as crystal.
Treasury of Scripture Knowledge
Summary
And the likeness of the firmament upon the heads of the living creature was as the colour of the terrible crystal, stretched forth over their heads above.
The likeness
Bible References
The likeness
Revelation 4:3
He who was seated on it was in appearance like a jasper and a sardius; and 'round the throne there was a rainbow' of the color of an emerald.
Revelation 21:11
Its brilliance was like that of some very precious stone, like a jasper, transparent as crystal.