King James Bible
His heart is as firm as a stone; yea, as hard as a piece of the nether millstone.

New King James Version
His heart is as hard as stone, Even as hard as the lower millstone.

American Standard Version
His heart is as firm as a stone; Yea, firm as the nether millstone.

Berean Study Bible
His chest is as hard as a rock, as hard as a lower millstone!

Douay-Rheims Bible
His heart shall be as hard as a stone, and as firm as a smith's anvil.

English Revised Version
His heart is as firm as a stone; yea, firm as the nether millstone.

World English Bible
His heart is as firm as a stone, yes, firm as the lower millstone.

Young's Literal Translation
His heart is firm as a stone, Yea, firm as the lower piece.

Job 41:24 Additional Translations ...