all that glitters is not gold
idiomPart ofgold
all that glitters is not gold — idiom
1. used to say that something or someone may look attractive or valuable on the out
1.idiom
Definition
used to say that something or someone may look attractive or valuable on the outside but is not actually good or real.
Example
The job offer seemed perfect, but Yael soon learned that all that glitters is not gold.
That flashy sports car looks impressive, but all that glitters is not gold; it breaks down constantly.