NFL Star Stevan Ridley -- Buys $20k In Bling From Bravo Star ... For Teammates

New England Patriots RB Stevan Ridley got a jump on the Xmas season -- dropping $20k on some sick bling for some of his favorite teammates ... TMZ Sports has learned.

Ridley -- along with Pats teammate Danny Amendola and former LSU teammate Ron Brooks -- recently hit up the Nialaya jewelry store in L.A. ... which happens to be owned by "Euros of Hollywood" star Jannik Olander.

We're told the guys picked out all sorts of rings, bracelets and necklaces ... but when the $20k bill came, Ridley picked up the tab.

Friends ... they're better when they're millionaires.

Check out the hardware ...