'You are joking': Couple's amazing beach find after losing engagement ring

A Gold Coast couple were shocked in the best way after an expert metal detectorist helped them find a lost engagement ring.

Engaged pair Natalie and Tom were throwing a Vortex ball while knee-deep in the water on a local beach when Natalie's spiralling pass tore the ring from her hand.

"I'm on the beach crying, we're both crying," Natalie told 9News.

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The couple searched for three days, aided by a metal detector they purchased, but to no avail.

"She was starting to lose hope, and I was too," Tom said.

But instead of giving up, they enlisted the help of metal detection recovery specialist Karen Preston.

And, unbelievably, they not only found the $4000 ring, but had the camera on to record their reactions.

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"Oh, you are joking me! Oh my God!" Natalie is heard saying.

The couple were glad their big day could get back on track.

"I was trying to be optimistic," Natalie said.

"I didn't really think it was going to come back though."