A single jewel in the Tower of London has seen the rise and fall of more empires, caused more bad luck and been more prized than any other precious stone on Earth. The Kohinoor is the most famous - and infamous - diamond in the world, but it’s only one of tens of thousands of jewels and numerous crowns that make up Britain’s most valuable treasure, the Crown Jewels. Now, to mark the Queen’s historic platinum jubilee - 70 years on the throne - Clive Myrie explores the objects that symbolize her a...