Floyd Mayweather's Jeweler Dishes on $1 Mil, Diamond-Encrusted Hat

Floyd Mayweather didn't just have diamonds all around his neck for the Gervonta Davis vs. Ryan Garcia fight over the weekend -- he apparently had 'em on his head too ... the boxing legend's jeweler tells TMZ Sports the lid Floyd rocked to the match was so encrusted in gems, it was worth over $1 MILLION, according to the jeweler!

Shuki Diamonds told us out in L.A. this week he spent over a month making the blinged-out cap for Mayweather ... and it took him even longer than that to find the perfect "invisible diamonds" for it.

Shuki says the process to get the jewels on the "The Money Team" hat was arduous ... explaining it took painstaking work to get the cap looking just right.

According to Shuki, he had to make a mold, sandblast it all, and then shine it so it'd be perfect for Floyd's head.

"It's a big process," Shuki said.

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