Fighting local favourite Jason Whateley in the final, Nyika was at his technical best with a clinical performance. He was far too quick for Whateley; slipping, moving, countering his way to a dominant unanimous victory, his fourth straight over the Australian.
"I can't describe it," Nyika said. "It's going to sink in soon. The first gold I was 18-years-old but, again, I've done something that hasn't been done before. I'm making history and it's incredible."
A huge presence of extended family belted out Tutira Mai Nga Iwi outside and the venue, urging on each Nyika shot. They erupted when the verdict was delivered, and Nyika's girlfriend couldn't hold back the tears as they embraced.
"I set myself a goal in the first round to silence the Aussies so my people could be heard. I think we accomplished that, and that meant a lot to me; to hear them drowning out the locals.
"I can't wait to kick my feet up, relax and enjoy celebrations with my family."
Boxers at these Gold Coast Games traded blows inside studios where movie blockbusters such as Pirates of the Caribbean were shot. Nyika is no Johnny Depp, but played the lead role here to perfection.
Unlike other Kiwi prospects expected to canter to gold, he handled the pressure with aplomb.
Nyika dyed his hair blond prior to the Games and adopted the nickname "pint of Guinness" for its apparent long, dark, strong properties.
Today he walked the talk.
Due to its brutality boxing does not sit well with everyone. If nothing else, you must appreciate the skill, fitness and intelligence required to hit and not be hit.
For Nyika, this is his art. And this was a masterpiece.
Getting to this point has not been easy, either. Nyika endured difficult build-up to the Games after a messy split from long-time coach Rick Ellis, with whom he welcomed guidance from since the age of 14. That evolved to the point he was reduced to training in a Hamilton car park.
Refusing to compromise ambitions, Nyika used that adversity to fuel his desire, traveling to the States and the UK to ensure elite training.
"I've worked incredibly hard to be here just to hold my head high. I've been through some ups and downs. I'm just glad I could do it. I've proven to myself, and the people who may have doubted me, or doubted my integrity, that I'm here to stay."
With that tumultuous journey behind him, Nyika faces tough choices about whether to turn pro or chase the Olympic dream.
"A lot of people are saying it makes sense to turn professional now but I've always wanted to go to the Olympics. The World Series Boxing is calling as well so I have a lot of thinking to do but I didn't want to look past this tournament and the opposition that was here."
Nyika's success sees this tight-knit NZ boxing team match their 1950 counterparts from Auckland, where five medals - gold, two silvers, two bronze - were won.
Here four bronze and Nyika's gold represents a historic haul after Tasmyn Benny claimed New Zealand's first female medal.
Troy Garton also collected bronze desipte tearing her ACL before the Games, and Patrick Mailata lost in his epic super heavyweight semifinal by split decision.
Today, though, belongs to Nyika.
Two golds is just the beginning.
