While the Crown Jewels are on display at the Tower of London, some of the most beautiful and blinging royal headwear is very much kept under lock and key. It means that we have to wait for assorted state occasions to catch a rare glimpse of these historic pieces, but when we do, it’s worth the wait! They’re made up of rubies, sapphires, emeralds, thousands of diamonds, smuggled pearls, and aquamarines the size of perfume bottles, so take a peek at the tiaras inside the royal vaults . . .