Prince Philip and Queen Elizabeth's romance spanned more than 70 years - but what did he hide in the engagement ring? And why did Jo Elvin describe it as 'the most romantic thing'?

The Daily Mail's royal editor Rebecca English also recalls what Catherine said to her after Prince William proposed - and the moment she first laid eyes on the most recognisable engagement ring in the world.

The panel also discuss which royal rock has the heftiest price tag - and which one they prefer.

PLUS Don't miss our most romantic montage to date featuring royal engagements over the years.

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