Jackson was a member of St. Louis' starting rotation following last year's Trade Deadline, going 5-2 with a 3.58 ERA in 13 starts. Jackson said he didn't know when he would get his ring, because the Nationals don't face St. Louis until the end of September.
"I had no clue it was coming today," Jackson said. "Davey called me into his office and said he had a certain surprise for me. I had no clue. I saw a couple of boxes, and I kind of put two and two together.
"It feels good [to get my World Series ring]. You put your blood, sweat and tears in something that is not given to anyone. You have to go out and earn it, and we definitely earned it. It's a good feeling to hold a World Series ring."