TMZ Sports is told Acuna -- a starting outfielder for Tuesday's All-Star Game after receiving the most votes among National League players -- copped a blinged-out nod to his aggressive style of play ... and it's incredible!!

The piece features Acuna's nickname, "La Bestia" -- which means "the beast" -- decked out in 12 carats of emerald-shaped VVS diamonds and 6 carats of round brilliant rocks ... and a gorilla enameled on top.

Gabriel The Jeweler tells us the chain is also made of 80 carats of VVS baguettes ... with the whole thing being worth a whopping $140k!!

We're told Acuna has plans to show off the bling when he takes the field at Dodger Stadium on Tuesday ... so keep your eyes peeled.

Acuna and superstar Vladimir Guerrero Jr. also got iced-out versions of their personal logos ahead of ASW ... which was a collaboration with Nick Drbal's Xample brand.

We're told Drbal -- both players' business manager -- designed the logos that inspired the shopping spree.

To top things off, the Xample team also walked away with a number of logo chains as well.