Natural Blue diamonds are so rare. This blue diamond is enhanced and treated. The treatment can only work with a small minority of diamonds, and involves irradiating them causing the colour change, usually followed by heat treatment to stabilise the colour.
Diana was a great diva, but there's only been one royal superstar over the past 60 years says historian who's watched the Queen's reign in wonder
The Queen on board the royal yacht Britannia in March 1971. The ship was the only place where the queen felt free enough to wear casual clothes such as slacks. Also, she was able to have the rooms decorated to her then young taste of simple, modern 1950's.