Answer:
Nobody. The word "glitters" does not appear in any of Shakespeare's works.
In Shakespeare's 'Merchant of Venice'(Act 2, scene 7), however, Prince of Morocco says;
"All that glisters is not gold,
Often have you heard that told
Many a man his life hath sold
But my outside to behold:
Gilded tombs do worms infold.
Had you been as wise as bold,
Young in limbs, in judgment old,
Your answer had not been inscroll'd
Fare you well; your suit is cold."
Note, the word is "glisters" not "glitters". It means we should not buy or accept something just because it looks good.