David Cameron has rejected suggestions Britain should return a giant diamond the country forced India to hand over during the colonial era.

The Koh-i-Noor – which is the world’s largest diamond – was was presented to Queen Victoria in 1850 and was later mounted into her crown, along with 2,000 other diamonds. It is the crown the Duchess of Cambridge will wear should Prince William become King.

But following his visit to the site of the Amritsar massacre in India, the Prime Minister ruled out the return of the gem as a further mark of atonement for Britain’s imperial past. According to The Sun, he quite simply declared: "They’re not having that back.”

kohinoor diamond

Cameron insisted that there was "an enormous amount" to be proud of in the British Empire, and said that the UK's historic links with India had a positive overall impact on the countries' modern-day relationship.

But he rejected the concept of "returnism", arguing that treasures such as the Elgin Marbles brought back to the UK during the imperial period should remain in British museums, while being made available to be "properly shared" with institutions abroad.

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On Wednesday Cameron became the first serving PM to visit the site of the 1919 massacre at Jallianwala Bagh in Amritsar, bowing his head in honour of the hundreds of people killed when troops under British command fired into a crowd of protesters.

Writing in a book of condolence, he said the episode was "deeply shameful" and should never be forgotten.

But he stopped short of apologising for an event which happened decades before his birth, saying that this would not be appropriate as the killings were condemned at the time by the UK authorities.

Asked later whether he would respond to Indian calls for the return of the Koh-i-Noor - Cameron said: "I don't think that's the right approach.

"It is the same question with the Elgin Marbles.

"The right answer is for the British Museum and other cultural institutions to do exactly what they do do, which is to link up with other institutions around the world to make sure that the things which we have and look after so well are properly shared with people around the world.

"I certainly don't believe in returnism, as it were.

"I don't think that's sensible."

Cameron accepted that there were "bad events" in the history of the British Raj in India, but insisted that Indians themselves would argue that the Empire also did much that was good for the country.

"I think there is an enormous amount to be proud of in what the British Empire did and was responsible for, but of course there were bad events as well as good events," the Prime Minister said.

"The bad events we should learn from and the good events we should celebrate. In terms of our relationship with India, is our past a help or a handicap?

"I would say that net, it is a help, because of the shared history, culture, the things we share and the contribution that Indians talk about that we have made.

"But obviously, where there are bad events we have to remember them and be clear about them and learn from them."

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  • Crown Koh-i-noor Diamond

    LONDON, UNITED KINGDOM - APRIL 19: The Crown Of Queen Elizabeth The Queen Mother (1937) Made Of Platinum And Containing The Famous Koh-i-noor Diamond Along With Other Gems. (Photo by Tim Graham/Getty Images)

  • Queen Mother death procession

    The Queen Elizabeth The Queen Mother's priceless crown, containing the famous Koh-i-noor diamond, rests on her coffin on a Gun Carriage pulled by the Royal Horse Artillery to Westminster Hall.

  • Queen Elizabeth II at the state opening of Parliament, London, in 1995, wearing the crown containing the koh-i-noor diamond. (Credit: Rex)

  • Executive Director of Jewels de Paragon (JDP) Pava

    BANGALORE, INDIA: Executive Director of Jewels de Paragon (JDP) Pavana Kishore shows the 'Koh-I-Noor' diamond on display with other famous diamonds at an exhibition intitled '100 World Famous Diamonds' in Bangalore 19 May 2002. The Koh-I-Noor diamond, which once belonged to Mughal Emperor Shah Jehan, weighs 105.60 Carats and is part of the British crown jewels, stored in the tower of London. AFP PHOTO (Photo credit should read STR/AFP/Getty Images)

  • An Indian model shows the replica of the famous In

    CALCUTTA, INDIA: An Indian model shows the replica of the famous Indian diamond 'Koh-i-noor' during a press meeting in Calcutta, 29 January 2002. Replicas of hundred worlds most famous diamonds are on public display in occasion of a show organised by a diamond-jewellery merchant. AFP PHOTO/Deshakalyan Chowdhury (Photo credit should read DESHAKALYAN CHOWDHURY/AFP/Getty Images)

  • Cubic zirconia replicas of the original and a modern Koh-i-N

    UNITED KINGDOM - NOVEMBER 27: Cubic zirconia replicas of the original and a modern Koh-i-Noor diamond are on display at the Natural History Museum's new permanent gallery ''The Vault'' in London, U.K., on Tuesday, Nov. 27, 2007. New York diamond dealer Alan Bronstein, whose gems go on show at London's Natural History Museum tomorrow, doesn't recommend colored diamonds as an investment. (Photo by Suzanne Plunkett/Bloomberg via Getty Images)

  • Diamond Collection

    circa 1860: The Koh-i-Noor and Regent or Pitt diamonds seen from different angles. (Photo by Hulton Archive/Getty Images)

  • Royalty - Coronation of George V - London

    Queen Mary's crown, made for the Coronation of King George V. The crown was made by Garrard & Co and contains 2,200 diamonds. It contained the Koh-i-Noor diamond as well as Cullinan III and Cullinan IV.