This is expressly said by Hesychius, and many epithets derived from adamas are applied to articles made of steel or of iron.
The Greeks name it adamas,—which signifieth, the invincible.
This was a material invented by Mr. Leoni, and named by him "adamas."
The name Diamond comes from the Greek adamas, which means unconquerable.
Lastly, others are oblong, and appear to me to be the adamas hexadrus tabellatus of Wallerius.
But it seems to be less known that adamas also at first denoted steel.
The alleged magical powers of the magnet are recited in Caput I., adamas.
Later Roman authors mentioned various rivers in India as yielding the adamas among their sands.