John Calleija introduces a Jubilee-inspired sculpture
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Rare pink diamonds go on display in London

9 October 2012 Last updated at 22:03 BST

Rare pink diamonds from Australia's Argyle mine have been displayed in Kensington, west London.

Josephine Johnson, manager of Argyle Pink Diamonds, calls them "stratospheric in terms of value".

Jewellery historian Vivienne Becker says they are "flukes of nature".