Lisa Alexander's team lifted for the master coach in her 100th Test, levelling the four match series at 1-1.
Gretel Tippett (23/24) was supreme under the ring, ably assisted by captain Caitlin Bassett (17/20) and Tegan Philip (8/9).
But this was a win masterminded by the back.
Goal keeper Courtney Bruce subdued the Maria Folau-led Silver Ferns attack with an intensity that lifted the whole Diamonds side.
The four-Test series now heads to Sydney and Perth, where wins would allow Australia to retain the trans-Tasman trophy for the seventh-straight time.