([[Hebrew language (EBD)|Heb]]. shamir), Ezek. 3:9. The [[Greek (EBD)|Greek]] word adamas means [[wikipedia:diamond|diamond]]. This [[Stones, Precious (EBD)|stone]] is not referred to, but [[Wikipedia:corundum|corundum]] or some kind of hard [[wikipedia:steel|steel]]. It is an emblem of firmness in resisting adversaries of the truth (Zech. 7:12), and of hard-heartedness against the [[Truth (EBD)|truth]] (Jer. 17:1).