I'm talking about Roc-a-Fella, my home
My chain: these ain't conflict diamonds
"Is they Jacob? Don't lie to me, man"

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

Meaning

Roc-a-fella is Kanye’s label, co-founded by Jay-Z. As mentioned above, their sign is the triangle-like “diamond sign”. But Kanye is also talking about the diamonds on his necklace — the “Roc piece” that he got as a gift when he signed to the label

Kanye wonders if Jacob the Jeweler — a famous jeweler to rappers and other celebrities — bought and used conflict diamonds on his Roc-a-fella chain. He’s like “c'mon Jacob, tell me the truth about my diamonds!”

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