The Silver Ferns have secured the Constellation Cup for only the fourth time, overcoming a determined Australian side to claim a dramatic 52-49 victory in Sydney.
After trailing for much of the contest, New Zealand produced a spirited final-quarter fightback to seal an unassailable 3-0 series lead against the Diamonds.
Australia controlled the early exchanges and repeatedly threatened to pull away, but the visitors remained within striking distance before turning the match in their favour.
Grace Nweke led New Zealand’s scoring with 41 goals, while Kelly Jackson and Karin Burger made crucial defensive contributions. The victory leaves the Silver Ferns chasing an unprecedented series clean sweep in Melbourne on Wednesday, where another win could also see them displace Australia at the top of the world netball rankings for the first time since 2013.