Maximilian Emerald Ring
The "Maximilian Emerald Ring" gets its name from one of its owners, an ill-fated archduke of Austria Ferdinand Maximilian Joseph whose misguided attempt to rule Mexico ended in his assassination in 1864.
The emerald was set on a ring for Emperor Maximilian Joseph, but after his death changed hands and eventually came into the possession of Marjorie M. Post. It was donated to the National Museum of Natural History of the Smithsonian Institution by her in 1964. The emerald's present setting by Cartier is enhanced by six baguette diamonds.