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Floyd Mayweather just outdid himself (and everyone else, too), dropping $1 MILLION on a BIG ass iced-out, white gold chain that weighs nearly 6 pounds!!

45-year-old Mayweather linked up with Johnny Dang — celeb jeweler and grill king — and while the boxing legend has a birthday coming up, we’re told he was just in the mood to treat himself,

And, did he ever … with the biggest necklace in the world (as far as JD knows).

The chain, which weighs 2.6 kilos (or 5.7 lbs.), is made of white gold and has 8,500 diamonds — a whopping 300 ct.’s — and costs 7 figures!

On the clasp of the Cuban link chain, in diamonds, are the letters “TMT” … for “The Money Team”.

It’s not the first time Mayweather has bought ridiculously expensive pieces from Dang … but it’s absolutely the biggest chain he’s ever bought.

Of course, Floyd retired from fighting professionally years ago … but TBE’s still putting on exhibition fights across the globe. In fact, Mayweather’s boxing Aaron Chalmers at the O2 in London on February 25 … and you can bet he’ll go home with another big check.