I'm certainly no expert on 'Jane Eyre'. I've tried reading it and watching dramatizations of it and I've repeatedly found it to be one of the dullest works of literature I've ever encountered. (Perhaps that's because I'm a fella'?).
However, I can state with confidence that, if Charlotte Bronte used the quote you refer to, she'd probably nicked it from Shakespeare ;-)
"All that glisters is not gold" is a quote from 'The Merchant of Venice'. However, the next line, "Often have you heard that told" is a clear indication that it was a well known proverb, even in Shakespeare's time.
References to the proverb, or Shakespeare's use of it, occur throughout literature. For example, in 1747 Thomas Gray wrote (in 'Ode on the Death of a Favourite Cat'),
"Not all that tempts your wand'ring eyes
And heedless hearts, is lawful prize;
Nor all, that glisters, gold"
Chris