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.
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She made five intercepts and was called for obstruction just four times in a defensive masterclass.
‘‘She just controlled the circle. She patrolled the circle tonight. It was absolutely fantastic to watch,’’ Alexander said.
Only once in the match did the contest look to be slipping from Australia’s grasp - the third-quarter spell when Folau (31/41) sank six shots without reply to whittle the Diamonds’ lead from 10 to four.