Revelation 4:6
And before the throne there was a sea of glass, like crystal. And in the middle of the throne, in the circle about the throne, there were four living creatures, full of eyes, before and behind.
Revelation 4:3
and he who sat on it, was in appearance like a jasper and sardine stone; and a rainbow, in appearance like an emerald, was round about the throne.
Revelation 21:11
having the glory of God; (its luster was like that of a precious gem, even as a jasper stone, clear 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
and he who sat on it, was in appearance like a jasper and sardine stone; and a rainbow, in appearance like an emerald, was round about the throne.
Revelation 21:11
having the glory of God; (its luster was like that of a precious gem, even as a jasper stone, clear as crystal,)