Meaning the proverb: Not everything that looks expensive or precious actually is.
The origins for the saying “all that glitters is not gold” can be traced as far back as the 12th century where French theologian Alain de Lille wrote a variant of the saying: “Do not hold everything gold that shines like gold.” After de Lille, other authors, poets and playwrights such as Chaucer, Cervantes, and Shakespeare have taken on the saying in various forms. The present form of the phrase originated in 1687 when English author John Dryden stated, “All, as they say, that glitters is not gold,” in The Hind and the Panther.
The looks are often deceptive. What we see may not be what it appears to be. It could be an imitation. Gold is a bright metal and has its own dazzle that attracts every eye. A shining piece of brass may hold our attention equally but it can never match the standard of gold. It is our eyes that convince us more than our brain.
As a result we are easily cheated by the crafty people. We get carried away by rich and fake glitters and become an easy victim to deceptive appearances. The proverb warns us to be careful and not blindly believe everything we see, howsoever attractive it may be. So be careful and try to see the essence of the things or people around you!