In 1998, together with, Bay of Plenty Magic, Capital Shakers, Canterbury Flames, Counties Manukau Cometz, Northern Force, Otago Rebels, Southern Sting, Waikato Wildcats and Western Flyers, Diamonds, were founding members of the Coca-Cola Cup/National Bank Cup league.

[1][2] Together with Cometz and Force, Diamonds were one of three teams from the Auckland Region to play in the league.

Due to poor ticket sales, the three teams faced early suggestions that they should merge.

[9][10][11] Between 2004 and 2007, Diamonds played the majority of their home matches at Waitakere's Trusts Stadium.

[12][13] They previously played home matches at Kohimarama's ASB Stadium.