Eagle-eyed Kiwis have spotted Prime Minister Jacinda Ardern sporting a ring on what appeared to be her left ring finger - but it might not be as it seems.

A video posted by Ardern to her Facebook page yesterday showed a large silver ring with a black stone on her ring finger.

While it appeared to be her left hand it may have simply been an illusion. Front-facing cameras on phones often flip the image.

Few questions from you about fuel prices so thought I would jump online to answer them...

Posted by Jacinda Ardern on Monday, 8 October 2018

However, it's not the first time speculation about whether Clarke Gayford has popped the question has been ignited online.

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In December last year, the Prime Minister quashed rumours she and Gayford were engaged after she wore a ring on her left ring finger.

"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," she said.

"I do however suffer from a small skin condition, which is not very romantic. Glad to have cleared that up."

Ardern has been approached by the Herald for comment.