Ardern told the BBC earlier this year that wanted to put her partner through the "pain and torture" of having to agonise over popping the question when asked if she would do so herself being a feminist.
The 38-year-old PM and her 41-year-old partner met at an awards event in 2012.
In 2017, just two months after Ardern was elected Prime Minister she was forced to address speculation she and Gayford were engaged.
“I thought I would upfront address the speculation in the gallery this afternoon over my Facebook Live and the issue of where my ring was placed during that Facebook live,” Ardern told media at a post-cabinet press conference. “I’m happy to confirm that I have eczema on my left hand, which causes me to rotate where I wear my beautiful onyx ring. So no I am not engaged.
“I do however suffer from a small skin condition, which is not very romantic. Glad to have cleared that up.”
While attending a memorial at the Pike River Mine on Monday in Greymouth, New Zealand, Ms Ardern opted to wear her ring on her middle finger to not draw attention away from those that had been affected by the tragedy.
29 men were trapped and killed underground following an explosion on 19 November 2010. The bodies of the men have to date not been recovered. The re-entry process that was due to recover the men today has begun but is now facing delays due to elevated levels of oxygen detected inside the mine.
Congratulations to the couple!