All that glistens is not gold

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All that glistens/glitters is not gold.

  (British, American & Australian) also All that glisters is not gold. (British literary)
something that you say to warn someone that sometimes people or things that appear attractive have no real value This film has an all-star cast, but all that glisters is not gold. It fails because of its weak story.
See also: all, glisten, gold, not
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.