And ain't a damn thing change but the bezel on my Rollie
And the diamonds in my chain, yeah

from Meek Mill – Ready or Not Lyrics on Rap Genius

Meaning

Meek won’t ever be fake. Nothing is changing with him, besides his Rolex and his chains. Most brand new Rolexes have a stock bezel (stainless-steel or gold circle engraved with numbers or markers which surrounds the glass) that can be replaced with an icey bezel insert consisting of however many karat levels in diamonds. Meek’s success has not only enabled him to buy a Rolex, but it has also given him the cash to upgrade it with diamonds.

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