The British Museum just revealed it lost a £750,000 diamond Cartier ring six years ago

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The missing ring in all its glory.
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British Museum

The British Museum lost a £750,000 diamond and platinum ring six years ago, a spokeswoman said.

The ring, created by Cartier and donated anonymously in 2001, went missing from the museum’s study collection in August 2011. It was not on public display at the time.

The incident was reported to the museum’s director, board of trustees, and the police at the time, the spokeswoman said. Police did not take the matter further.

The missing ring was written off as a £750,000 loss in the museum’s 2016/17 financial report, which was published on July 13. The Daily Mail was the first publication to note its disappearance on Wednesday.

The missing ring was not declared earlier by the British Museum because it is only required to publish lost items five years after the initial discovery of their disappearance.

“The Museum takes the security of the collection extremely seriously,” the spokeswoman said. “The Museum has since reviewed its security and collections management procedures and dedicated significant investment to improved security across the estate.”