Queen's Williamson diamond brooch: Reason why it's valued at £25million

QUEEN ELIZABETH'S Williamson pink diamond brooch is the second most valuable brooch in her collection, and a jewellery expert has explained why.

The Williamson Diamond Brooch - 2012-06-29 - Royal Diamonds Exhibition at Buckingham Palace

From one Williamson Pink to the other - HIGH JEWELLERY DREAM

Queen's Williamson diamond brooch: Reason why it's valued at £25million

Queen's Williamson Pink Diamond Brooch

The Queen's £25million broach that is one of the most 'flawless' diamonds in world - MyLondon

The Williamson Diamond Brooch - 2012-06-29 - Royal Diamonds Exhibition at Buckingham Palace

Are pink diamonds the rarest color of diamond? - Quora

Queen's Williamson Pink Diamond Brooch

Queen reportedly changed original use of Williamson brooch's pink diamond

Queen reportedly changed original use of Williamson brooch's pink diamond

Royal jewels: Queen's Williamson pink diamond brooch