The largest known faceted peridot (310 carats) is displayed at the Smithsonian Institution, Washington, D.C. Now a part of the Diamond Treasury in Moscow, Russia, is a yellowish-green 192.75-carat stone which belonged to the czars. A step-cut peridot of 146 carats is in the Geological Museum, London, England. The collections of the American Museum of Natural History in New York and the Chicago Museum of Natural History have included beautiful examples of peridot. Many peridots were taken to Europe by crusaders returning from the East and kept in cathedrals. Especially fine specimens are in the cathedral in Cologne.