Danish Crown Prince Frederik is offering a reward to anyone who recovers a priceless ring he lost while diving in the coral reefs off Florida's Key West.

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The loss of Fredrick's wedding ring, which was made from the first gold discovered in Greenland, led to two weeks of unsuccessful searches by diving teams, The Copenhagen Post reported Wednesday.

The 39-year-old prince, who married in 2004, has offered a plane ride to Denmark and a tour of Fredensborg Castle as a reward for anyone who finds the missing item.

However, divers who participated in the search didn't see the ring's recovery as likely.

"It's like looking for a needle in a haystack," one diver said.