Carolina Panthers receiver Robby Anderson is commemorating his journey from going undrafted to being a 6-year vet ... by getting an awesome ring decked out in diamonds!!

The 28-year-old ex-Temple standout was passed up by literally every team in the league in 2016 ... but made the most of his opportunity when the New York Jets took a chance on him.

He went on to sign a 2-year, $20 MILLION deal with Carolina in 2020 ... posting career highs in receptions (95) and yards (1,096) last season.

Now, Anderson is treating himself to a meaningful keepsake in honor of his success ... hitting up Gabriel The Jeweler to cop an INCREDIBLE ring with 16 carats of VVS diamonds!!