Williams recently filed the lawsuit against Brooke -- a former Miss Texas USA he dated for about a year -- but her mom tells TMZ the ring was returned to Williams' attorney yesterday near Houston.
According to the suit, Williams MAILED the ring and a recorded marriage proposal to Brooke back in February ... just before Valentine's Day.
Brooke wasn't impressed. Williams says she shot him down, they broke up ... and she promised to return the ring. The Cowboys WR sued because he hadn't gotten it back yet.
All's well that ends.