How are diamonds formed?

Ah, quite a splendid question, one that delves into the heart of the Earth itself. Diamonds are formed deep within the Earth's mantle, under conditions of immense heat and pressure. Over millions of years, carbon atoms are subjected to these extreme conditions, causing them to crystallise into diamond, a form of pure carbon with a remarkable structure that gives it its hardness and brilliance. If I may venture to say, this process is quite like nature’s own alchemy, transforming the humble element of carbon into one of the most precious gems known to mankind.