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.

Royal Family: The Queen's massive £25 million brooch with the most valuable diamond in the world - MyLondon

Queen's Williamson Pink Diamond Brooch

25 of the Queen's most valuable brooches – VISIT

Williamson pink diamond - Wikipedia

25 of the Queen's most valuable brooches – VISIT

The history behind Queen's £25million brooch - One of most 'flawless' diamonds in world

Queen's nickname for diamond brooch worth over £50 million and who owns it now - Mirror Online

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

Queen's Williamson Pink Diamond Brooch

Queen's best brooches: Her Majesty's Williamson diamond brooch is worth a huge £25million

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

Queen's Williamson Pink Diamond Brooch

Platinum Jubilee Jewel Countdown: The Williamson Pink Diamond Brooch

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

Queen's best brooches: Her Majesty's Williamson diamond brooch is worth a huge £25million