The diamond was mounted successively on the crowns of Louis XVIII, Charles X and Napoleon III. Today, mounted in a Greek diadem designed for Empress Eugenie, it remains in the French Royal Treasury at the Louvre. It has been on display there since 1887.

The Sovereign's Sceptre with Cross, 1661\n\n It was transformed in 1910 for George V by the addition of the spectacular Cullinan I diamond. At 530.2 carats, it is the largest colourless cut diamond in the world. The Cullinan Diamond was discovered in 1905, in modern-day South Africa.

What is D'Alembert's Principle? For a system of mass of particles, the sum of the difference of the force acting on the system and the time derivatives of the momenta is zero when projected onto any virtual displacement.

Applications of D'Alembert's Principle\n\n D'Alembert's principle is based on the virtual work principle as well as inertial forces. The following are examples of D'Alembert's principle in action: Free fall of a mass under gravity. Theorem of Parallel axis.