all that glistens is not gold

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all that glistens is not gold

Things that have an outward appeal are often not as beautiful or valuable as they seem. I don't know if that necklace from the flea market will have the resale value you're anticipating. All that glistens is not gold, you know. A: "I want to grow up to be a movie star, then I won't have a care in the world!" B: "Just remember that all that glistens is not gold. The pressures of fame can be difficult."
See also: all, glisten, gold, not, that

ˌall that ˌglitters/ˌglistens/ˌglisters is not ˈgold

(saying) not everything that seems good, attractive, etc. is actually good, etc: Don’t imagine that because they are rich, they are happy. All that glitters is not gold.
The verbs in this idiom all mean ‘shine brightly’.
See also: all, glisten, glitter, gold, not, that
References in periodicals archive ?
INSPIRED: A print from 2011 Royal College of Art student, Sarah Simmonds, entitled Othello, on show in Stratford BARD WORK: All That Glisters Is Not Gold, by Eleanor Lines, a student at the Royal College of Art, on show at the RSC the Royal College of Art, on show at the print exhibition in Stratford
But it seems that all that glisters is not gold as fears grow customers could be exploited following a boom in firms offering money for unwanted gold items.
Walsall Council trading standards manager John Beavon said: "I'm afraid that all too often, when buying from an unknown trader on an internet auction site, all that glisters is not gold.