But as he had bought the ring in Hong Kong, he was not able to return it - so he decided to hold the treasure hunt in the hope of finding a worthy recipient.
"Obviously, it's been a pretty unlucky ring for me," Mr Gardiner told the newspaper.
He said he hoped it ended up with "somebody who's keen, who's found a cool chick and who wants to give them something they normally wouldn't be able to afford."
The ring has five 0.25 carat diamonds set in white gold.
Mr Gardiner will start posting clues to the ring's whereabouts on his Twitter site at 8am local time on Saturday.
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