Fool's gold.
Fool's gold.
Fool's gold" refers to something that appears valuable or genuine but is actually worthless. Historically, this idiom comes from pyrite, an iron sulfide that has a superficial resemblance to gold. In a broader sense, the term is applied to describe any deceptive thing that tricks one into believing it’s more valuable or promising than it actually is.
Many thought the deal was perfect, but it turned out to be fool’s gold.
Many believed the deal was perfect, but it turned out to be deceptive.
The shiny mineral looked valuable but was just fool’s gold.
The shiny but worthless mineral looked valuable.
Investors thought the startup was a goldmine but it ended up being fool’s gold.
Investors thought the startup was highly valuable but it turned out to be deceptively worthless.