Emerald
Emerald Origin Size Location
Bahia Emerald Brazil , 2001 180,000 carats , crystals in host rock Los Angeles County Sheriff 's Department
Carolina Emperor United States , 2009 310 carats uncut , 64.8 carats cut North Carolina Museum of Natural Sciences , Raleigh
Chalk Emerald Colombia 38.40 carats cut , then recut to 37.82 carats National Museum of Natural History , Washington
Duke of Devonshire Emerald Colombia , before 1831 1,383.93 carats uncut Natural History Museum , London
Emerald of Saint Louis Austria , probably Habachtal 51.60 carats cut National Museum of Natural History , Paris
Gachalá Emerald Colombia , 1967 858 carats uncut National Museum of Natural History , Washington
Mogul Mughal Emerald Colombia , 1107 A.H. ( 1695-1696 AD ) 217.80 carats cut Museum of Islamic Art , Doha , Qatar
Rockefeller Emerald Colombia 18.04 carats Octagonal step-cut Private collection
Patricia Emerald Colombia , 1920 632 carats uncut , dihexagonal ( 12 sided ) American Museum of Natural History , New York
Mim Emerald Colombia , 2014 1,390 carats uncut , dihexagonal ( 12 sided ) Mim Museum , Beirut
Notable emeralds
Emerald is a gemstone and a variety of the mineral beryl (BeAl(SiO)) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5-8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.