A man was overjoyed when he discovered a diamond ring worth $40,000 on a beach in Florida last month, and soon became a metal detector angel.

Joseph Cook found the ring buried in the sand at Hammock Beach in St Augustine and immediately posted a video he shot while digging it up to his social media channels searching for people who may have lost rings.

The 37-year-old is heard exclaiming in shock: "No way, man. Whoah, look at that bad boy. Holy crap, that's real."

"This is the biggest diamond I ever found on the beach."

When he went to the jewelers, they reportedly told him the precious gem set in a platinum band was worth $40,000.

"I couldn't believe it."

Two weeks later, Joseph began receiving calls from a number he didn't recognize.He initially ignored them, but then realized it could be the owners of the ring.

He joined a video call with the couple from Jacksonville, who had lost one that was similar.

"The wife said, ‘oh my god I can't believe it', and then she just started crying."

Three weeks after finding the ring, Joseph met the owners near the same beach in St. Johns County and returned the piece.

"It felt really good," he recalled. "I've returned sixty-thousand dollars of stuff this year, but nothing even close to this before."

He said he really wasn't disappointed that he had to return it, and is looking for owners of other rings he's found in the past. He even wears a necklace with about 25 rings on it just so might be able to return them to their owners.

"Karma's always good. Every time I return an item, I find something better, so I'm happy I could give it back."

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