Luke Campbell was named best boxer at the Gee Bee tournament in Helsinki after winning the 56kg final.
The British southpaw beat Finland's Matti Koota 4-1 in the final after neither boxer had scored a single point entering the final round.
Tom Stalker beat Australia's Jeff Horn 12-2 to win the 64kg gold and in the 69kg final Scott Cardle beat Aleksander Klinkov of Russia by a walkover.
Alongside GB's three golds, Thomas Stubbs and Anthony Ogogo won silvers.
Ireland won five gold medals from five finals to finish on top of the medals table at the 15-nation tournament.
Michael Conlon, David Oliver Joyce, Jason Quigley, Ken Egan and Tommy McCarthy all had their hands raised in triumph.