ESV: Over the heads of the living creatures there was the likeness of an expanse, shining like awe-inspiring crystal, spread out above their heads.
NIV: Spread out above the heads of the living creatures was what looked something like a vault, sparkling like crystal, and awesome.
NASB: Now over the heads of the living beings there was something like an expanse, like the awesome gleam of crystal, spread out over their heads.
CSB: Over the heads of the living creatures the likeness of an expanse was spread out. It gleamed like awe-inspiring crystal,
NLT: Spread out above them was a surface like the sky, glittering like crystal.
KJV: 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.
NKJV: The likeness of the firmament above the heads of the living creatures was like the color of an awesome crystal, stretched out over their heads.