Adamas

.
historical examples

this is expressly said by hesychius, and many epithets derived from adamas are applied to articles made of steel or of iron.
a history of inventions, discoveries, and origins, volume ii (of 2) johann beckman

the greeks name it adamas,—which signifieth, the invincible.
sulamith: a romance of antiquity alexandre kuprin

this was a material invented by mr. leoni, and named by him “adamas.”
gas burners owen merriman

the name diamond comes from the greek adamas, which means unconquerable.
birds and nature, vol. 12 no. 4 [september 1902] various

lastly, others are oblong, and appear to me to be the adamas hexadrus tabellatus of wallerius.
the history of the revolutions of portugal abb vertot

but it seems to be less known that adamas also at first denoted steel.
a history of inventions, discoveries, and origins, volume ii (of 2) johann beckman

the alleged magical powers of the magnet are recited in caput i., adamas.
on the magnet, magnetick bodies also, and on the great magnet the earth william gilbert of colchester

later roman authors mentioned various rivers in india as yielding the adamas among their sands.
encyclopaedia britannica, 11th edition, volume 8, slice 4 various