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Rolf replied that he had bought the olive-green gem on eBay a few years before.

Proposed in 1961 by physicist Rolf Landauer, this limit defines the minimum amount of heat required to change information in a computer.

The group's leader Kian Reme, whose brother Rolf was among those killed, said much of the inquiry was held behind closed doors and a lot of the information it relied upon was not made public.

They include Rolf Harris, who went to prison for indecent assault, and Anthony Blunt, the former art adviser to the Queen who turned out to be a Soviet spy.

The tour took her to Europe, where she caught the eye of Rolf Liebermann, the impresario known for reviving the Paris Opera.