Jonathan Stroud

As an author, you need to keep talking to your audience to remind yourself what they like and what they don't like. You spend most of your life locked in a room, and you need to be social occasionally.

The price of diamonds can vary greatly depending on size, cut, color, and other factors, including whether they have a history. But because of the rarity of blue boron diamonds, they often fetch more money than gems of similar quality.

I like to be busy. I once shared an agent with the late Sir John Gielgud, who, at 96, was apparently still ringing up, saying, 'Hello, Gielgud here, any work?' Good on him. We've got to keep working. If we retire, there'll be nobody to play the old wrinklies, and that would be a dreadful shame.