Post Malone is celebrating a new addition to his already impressive jewelry collection -- a blinding 23 carats worth of diamonds, and all that bling is just for the littlest finger of them all.
Guess his hand was feeling a little light, because sources close to Post tell TMZ ... he called up his pals at Angel City Jewelers to hook him up with a new piece for his pinky.
Angel City's owner, Isaac Bokhoor, came through with the goods while PM was making a recent tour stop in Las Vegas ... and unveiled the "Rockstar" sized ring ... which we're told set the singer back about half a million bucks!
For that kinda dough, ya better love it ... and Post clearly does. Check out his reaction right after getting it backstage -- you're looking at a 5-carat Emerald cut center stone, with another 5 carats of round diamonds on the side. There are 13 more 1-carat stones around the band.