Geologically speaking, Colombian emeralds are said to be the purest emeralds in the world because Colombian emerald deposits are the only ones on earth found in sedimentary host rock rather than in Igneous rock. The tectonic movements that created the Andes Mountains force the raw materials of emeralds—beryllium, chromium, and vanadium—found in the ground into liquid and gaseous states. These materials, in such states, find their way into cracks in the already sedimentary medium surrounding them and then eventually cool and crystallize. A saline solution found in the sedimentary rock eventually washes out impurities such as iron that cloud other beryls from forming onto the crystallizing stone. This intricate process produces the emeralds found in the mines of Colombia.^[1]

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