The boxing legend's lavish retirement has seen him splash bottomless pits of cash on mansions, private jets and even a strip club.
But his timepiece, aptly named "The Billionaire Watch", might be one of the most lucrative purchases yet.
Sitting on his front row seats at a basketball match between Los Angeles Clippers and Denver Nuggets, it was hard to miss the piece of sparking jewellery.
Wearing t-shirt and black jeans, it was fully exposed to spectators sitting close to him who managed to get a good glimpse at the luxury item.
Mayweather purchased the Jacob & Co watch this summer and was quick to show it off on Instagram.
He continues to hold the reign of the wealthiest sportsman as released by Forbes.
And his fortune will only increase if he comes out of retirement to take on UFC ace Khabib Nurmagomedov.
The Russian called him out after his win over Conor McGregor, and Mayweather is happy to fight both again because they will involve "crazy numbers."
He said: "McGregor was talking that s*** so it ain’t over.
“After Me and Khabib we lock-up, me and McGregor going to lock-up again.
They say, why you keep fighting all them MMA guys? – man listen, me and Khabib going to do crazy numbers, me and McGregor going to do crazy numbers.
“I only clash with guy that can do crazy numbers."
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