King James Version
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.English Standard Version
Over the heads of the living creatures there was the likeness of an expanse, shining like awe-inspiring crystal, spread out above their heads.New International Version
Spread out above the heads of the living creatures was what looked like an expanse, sparkling like ice, and awesome.