Flaunt the Emperor’s Emerald. This adaptation of our Smithsonian Emperor Maximilian Ring features a silver-toned band and cubic zirconia. Assembled in the USA. The stone is 14x10mm oval shape, which would be the equivalent, if a real Emerald, of approximately 5.50 carats. Once set in a ring of Maximilian I (crowned emperor of Mexico in 1864), the stunning 21-carat Colombian emerald was later reset in a Cartier, Inc. design with six baguette-cut diamonds. The original was donated to the Smithsonian in 1964 by Marjorie Merriweather Post.