The Gachala Emerald, an uncut 5-cmemerald crystal weighing 858 carats, is named after the mining district where it was found in Colombia in 1967. It was donated to the Smithsonian Institution by the New York jeweler, Harry Winston. CM or cm may stand for: Cameroon (ISO country code) Roman numeral for 900 Chelmsford: CM is the British post code for the region in eastern England which is served by the Chelmsford postal sorting office. ... For other uses, see Emerald (disambiguation). ... The carat is a unit of mass used for gems, and equals 200 milligrams. ... The Smithsonian Institution Building or Castle on the National Mall serves as the Institutions headquarters. ... Official language(s) None, English de facto Capital Albany Largest city New York City Area - Total - Width - Length - % water - Latitude - Longitude Ranked 27th 141,205 km² 455 km 530 km 13. ... This article does not cite its references or sources. ...
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