Harlem rapper A$AP Ferg and Boston Celtics guard Jaylen Brown are good friends.

Brown, who is fresh off a brand new, $115 MILLION deal with the Celtics was out partying with friends for his birthday when Ferg gifted him with some sick jewelry. 

TMZ Sports is reporting that Ferg hit up Big Will at WS Jewelry and the guys collaborated to make him a "one-of-a-kind piece."

The piece comes with 15 carats of natural green and white diamonds shaped in Ferg's signature logo, and it cost around $20,000. 

Happy Birthday, Jaylen.