My wife and I went to London for our honeymoon. She had read that the real jewels weren’t on display, and had asked the guard on duty about this nugget o’ trivia. Lightly offended, he said that one of them was in fact crystal and that we should take another look. Because it was late November, we could circle ‘round back to the front and look at them twice. I managed to pick the crystal out from the diamonds. Needless to say, I felt cool.