If you didn't know where Amari Cooper was born and raised, you'll sure as hell know now ... 'cause the Dallas Cowboys superstar is reppin' his hometown with a $250k chain!!
TMZ Sports has learned ... the 25-year-old receiver wanted to do something extra special to show pride for his old Coconut Grove neighborhood in Miami, so he hit up his go-to guy, Gabriel the Jeweler, to come up with something crazy.
We're told Gabe worked 2 weeks to come up with the perfect piece for Amari ... and it's complete with 35 carats of emerald cut VVS diamonds and 30 carats of round diamonds.