(Heb. shamir), Ezekiel 3:9 . The Greek word adamas means diamond. This stone is not referred to, but corundum or some kind of hard steel. It is an emblem of firmness in resisting adversaries of the truth ( Zechariah 7:12 ), and of hard-heartedness against the truth ( Jeremiah 17:1 ).

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.