
steinern
made of stone
Made of or consisting of the material stone.
Eine alte, steinerne Brücke führte über den Fluss.
An old stone bridge led across the river.
stony
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made of stone
Made of or consisting of the material stone.
Eine alte, steinerne Brücke führte über den Fluss.
An old stone bridge led across the river.

stony
In a figurative sense: showing no visible emotion, motionless, or seeming hard. Often used for facial expressions.
Er nahm die Kritik mit steinerner Miene entgegen.
He received the criticism with a stony expression.
The adjective 'steinern' (stony/made of stone) is formed from the noun 'der Stein' (the stone) and the suffix '-ern'. This ending often means 'made of the material ...'.
Der Wanderweg führte über eine steinerne Treppe den Berg hinauf.
The hiking trail led up the mountain over a stone staircase.
The meaning of 'steinern' (stony/made of stone) depends on the noun. If it describes an object like a wall or bridge, it means 'made of stone'. If it describes a facial expression, it means 'emotionless'.
Er hörte die schlechte Nachricht mit steinernem Gesicht.
He listened to the bad news with a stony face.
In the figurative meaning, 'steinern' (stony) is very often used in the fixed combination 'eine steinerne Miene' (a stony expression). This describes a facial expression that shows no feeling at all.
Während der gesamten Verhandlung behielt der Angeklagte eine steinerne Miene.
Throughout the entire trial, the defendant kept a stony expression.
hard
Both a harter and a steinerner facial expression can seem unapproachable. Hart emphasizes strictness or relentlessness, while steinern additionally describes a motionless face with no visible emotions. steinern is therefore more precise for a mask-like calmness.

Mit steinernem Gesicht hörte der Chef die Bitte an, ohne eine Regung zu zeigen.
With a stony expression, the boss listened to the request without showing any reaction.
Mit hartem Gesicht wies der Chef jede Bitte um eine Pause zurück.
With a stern expression, the boss rejected every request for a break.