be carved in stone

To be made permanent, typically of a plan or idea. We might get brunch next weekend, but nothing is carved in stone yet.

be carved/set in stone

if an arrangement, a plan, or a rule is set in stone, it is completely fixed so that it cannot be changed (usually negative) The rules aren't set in stone; they can be altered to suit changing circumstances. These are just a few ideas to be discussed - nothing is carved in stone.

Common Names:

Name	Pronounced	Usage
Llywelyn	li-WEL-in	Welsh
Godefroy	-	French
Sexton	['sekstən]
Eguzki	-	Basque
Joselyn	JAHS-lin, JAHS-ə-lin	English (Modern)
Sharmaine	shahr-MAYN	English (Rare)