The Dragons trailed 14-3 after scores from Lloyd Williams and Gareth Anscombe had given the Blues the advantage but Hallam Amos' try just before the interval changed the course of the match - Nic Cudd then got himself over and a penalty try sealed the win.
And after prevailing in a closely-fought encounter, Jones insists his young troops are going from strength to strength.
"We've lots of young lads and the quarter-final was a big experience for them. You saw at the start that they were trying too hard, freezing and making uncharacteristic errors," he told Wales Online.
"But we need that in the bank to become better players and the next challenge is another massive game at Murrayfield.
"It's another learning curve and once you taste it and like it, you want more of it. Success breeds, it's wonderful.
"As a player and a coach I've been fortunate enough to be involved in these games and I am delighted that the young boys in our squad have felt that and sensed what an occasion it was."
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