Adrien Broner: Joins In On 'Championship Ring' Frenzy ... Drops $84k On Bling

What does Adrien Broner have in common with Chris Brown and Drake?

It pays to be friends with all three guys apparently ... 'cause Broner just laced his crew with the same Championship style rings that Drizzy and Breezy hit their teams with.

Broner hit up Avianne & Co in NYC -- jewelers to HUGE stars like Chris Brown and Future -- and commissioned championship rings for himself and his closest friends ... to commemorate winning a title in his 4th weight class.

Joe Avianne tells TMZ Sports each ring consisted of 60 grams of 14 karat yellow gold and 12 carats of flawless diamonds with "ABOUT BILLIONS" engraved on the side.

Final price tag for the whole haul ... $84k!!!!!