Amari Cooper's New Cowboys Jersey Diamond Necklace Looks Like He's In Dallas For Awhile

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TMZ Sports has learned ... A.C. hit up Gabriel the Jeweler -- the go-to guy for huge stars like Antonio Brown, OBJ and Jarvis Landry -- earlier this month to solidify his spot with America's team.

FYI --Cooper's expected to sign an extension with Dallas this offseason ... and after the production he's put up, the dude is expected to cash in with a fat, new deal before the end of next season.

We're told the jersey -- valued at $65k -- was part of Cooper's recent bling haul, complete with a 45-carat Cuban chain and 15-carat bracelet ... worth $140k total!!

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