National Museum of Natural History
10th Street and Constitution Avenue, NW
2nd Floor, East Wing, in the Geology, Gems, and Minerals Hall Floor Plan
On view is the 23.1-carat Carmen Lucia ruby, one of the largest faceted Burmese rubies known to exist. The stone is set in platinum and flanked by 2 triangular colorless diamonds measuring 1.1 and 1.27 carats.