Aaron Gordon Gifts Jamal Murray 'JM27' Diamond Pendant Before NBA Finals

Aaron Gordon is a helluva basketball player and apparently one whale of a teammate too ... 'cause TMZ Sports has learned the Nuggets star gifted Jamal Murray a sick diamond pendant before the start of this week's NBA Finals.

We're told AG was so thrilled over the way Murray's helped lead Denver this season ... he hit up Mile High Jewelers to make a custom piece to show his appreciation.

Gordon wanted the new bling to represent Murray's signature on-court celebration ... and the jeweler certainly delivered.

You can see the piece features a bow and arrow ... with Murray's initials and jersey No. 27 in it. We're told it's all filled with 10 carats of white and blue VVS diamonds.

We're also told it took 10 days to make, which is an expedited time as Gordon wanted to be sure Murray had it before the start of the NBA Finals on Thursday.

And, check out the video, Murray was pumped to receive it earlier this week!!

"[Aaron] wanted to show his appreciation for his outstanding play, effort and being a great teammate/brother during his time in Denver," the jeweler told us.

Murray is certainly deserving of the present from Gordon -- the 26-year-old averaged 20 points, 6.2 assists and 4 rebounds per game in the regular season ... and has absolutely balled out this playoffs.