All that glitter's not gold

from A Tribe Called Quest (Ft. Diamond, Lord Jamar & Sadat X) – Show Business Lyrics on Rap Genius

This is a reference to Shakespeare’s The Merchant of Venice:

O hell! what have we here?
A carrion Death, within whose empty eye
There is a written scroll! I’ll read the writing.
All that glitters 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 enfold.
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.

Also it could be a pun on his name, his name is Diamond D and diamonds do glow so he could be saying even though I’m not gold i still shine.

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