Berean Study Bible
Spread out above the heads of the living creatures was the likeness of an awesome expanse, gleaming like crystal.

King James Bible
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.

American Standard Version
And over the head of the living creature there was the likeness of a firmament, like the terrible crystal to look upon, stretched forth over their heads above.

Darby Bible Translation
And there was the likeness of an expanse over the heads of the living creature, as the look of the terrible crystal, stretched forth over their heads above.

Douay-Rheims Bible
And over the heads of the living creatures was the likeness of the firmament, as the appearance of crystal terrible to behold, and stretched out over their heads above.

English Revised Version
And over the head of the living creature there was the likeness of a firmament, like the colour of the terrible crystal, stretched forth over their heads above.

Young's Literal Translation
And a likeness is over the heads of the living creatures of an expanse, as the colour of the fearful ice, stretched out over their heads from above.