This episode of Ulisse is dedicated to the most extraordinary jewels in history, and everything behind them: technique, art, nature. The episode takes its cue from the largest diamond exhibition ever held: in fact, some of the most famous jewels from museums and private collections have been brought together at the Natural History Museum in Paris. Necklaces, brooches, solitaires, tiaras, worn by queens and kings of the past, when even men adorned themselves with jewels. The particular venue of the exhibition, a Natural History Museum, will allow us to talk about the origin of diamonds, which are formed beyond the 120 kilometers of the Earth's depth, at pressures of over 10 thousand atmospheres. We will see how diamonds are also formed in space: a meteorite studded with microscopic diamonds is on display at the exhibition. Ulysses will then show how diamonds are cut, going to one of the most prestigious laboratories, and how they are extracted from the earth today.