I drop jewels, wear jewels, hope to never run it

from Nas – Halftime Lyrics on Rap Genius

Meaning

Rapping a good line — or any activity that expands knowledge — is often described as “dropping a jewel” (cf. 2pac)

Then, he talks about literal jewels

Continuing the “jewels” wordplay, to “run” your jewels is to get your jewelry taken from you, presumably at gunpoint.

On Supa Ugly, Jay-Z claims that Nas:

had to buy back your chain last time you got robbed—the nerve of this coward, oh my god!

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