How to Say "flint" in Spanish
The Spanish word for “flint” is “piedra” — B1 level.

Examples
Le regaló un anillo con una piedra preciosa.
He gave her a ring with a precious gemstone.
El doctor dijo que tengo una piedra en el riñón.
The doctor said I have a kidney stone.
Tuvimos que usar una piedra de mechero para encender la fogata.
We had to use a lighter flint to start the campfire.
Figurative Hardness
When describing a person who is cold or emotionless, you can say 'tiene un corazón de piedra' (he/she has a heart of stone).
Translating Idioms
Mistake: “Using 'piedra en el zapato' in a literal context when you mean a physical pebble.”
Correction: This idiom is only used to mean a persistent problem or annoyance. Use 'guijarro' or 'piedrita' for a physical pebble in a shoe.
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