The "Maximilian Emerald Ring" gets its name from an owner, Ferdinand Maximilian Joseph, the archduke of Austria and the younger brother of Emperor Francis Joseph, He was the Emperor of Mexico in 1864. The Maximilian Emerald is a 21.04-carat, emerald-cut. After the Emperors death the ring was reset by Cartier with the addition of diamonds and eventually donated to the National Museum of Natural History of the Smithsonian Institution. We know you wont want to parted from this ring; and will want it with you forever.