The pressure's on, but guess who ain't gonna crack?
Haha, pardon me, I had to laugh at that

from Kanye West (Ft. Jay Z) – Diamonds From Sierra Leone (Remix) Lyrics on Rap Genius

Meaning

Since Jay has lost some friends and business partners, the responsibility of keeping Roc-A-Fella relevant is all on him, but he is ready for it

Pressure/crack is a reference to diamonds, which are created by high pressure conditions in the Earth and are extremely difficult to crack

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