NFL's Von Miller: Droppin' $40k On Sick Diamond Grill!

Von Miller is pimping out his million dollar smile ... with an insane $40,000 DIAMOND AND GOLD GRILL ... and TMZ Sports has the pics!

We spoke with grill guru Johnny Dang -- who's made crazy pieces for huge stars like Kylie Jenner, Fetty Wap and Bieber -- who says he just completed work on a sick custom piece for the Super Bowl MVP.

Miller's piece has everything from 18k gold to baguette and princess cut diamonds -- all VVS stones!

And that's not all ... we're told Von already has Johnny working on ANOTHER grill that'll be finished in a few weeks.

Gotta have a spare!!