What are the origins of Jay-Z's ';Roc Sign';?

I know his famous hand gesture is supposed to be a diamond and it basically represents his record label Roc-a-Fella and ';The Dynasty';





But does anyone know how they came up with it exactly?What are the origins of Jay-Z's ';Roc Sign';?
';Rocafella had AIDS that was the end of his chapter,


And thats the guy you choose to name ya company after/';





Nas

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