Diddy was feeling generous in Brooklyn Friday night ... tossing what is surely a super expensive, diamond-encrusted chain into the crowd.
The rapper was headlining the Bad Boy Family Reunion Tour at the Barclays Center when he hurled the bling.
The concert looks awesome ... Jay Z, Nas, Rick Ross, Mary J Blige, Busta Rhymes, Lil Kim, Usher and French Montana all performed.
BTW ... it's Puff Daddy now.
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