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After 50ct the price is much higher and cannot be estiminated, it can cost up to millions per carat.  The state departments in Colombia where most of the emerald mining takes place are in the regions of Boyacá and Cundinamarca, both found on the eastern ridge of the Andes Mountains that runs north-south throughout the entire country. Because of the rarity of sedimentary rock found in the emerald deposits of the Andes Mountains, Colombian emerald companies believe this condition to be the reason why Colombian emerald deposits are, "the purest emerald deposits found on earth."
Although the Colombian emerald trade has a rich history that dates as far back as the pre-Spanish period, the increase in worldwide demand for the industry of precious stones in the early 20th century has led prices for emeralds to nearly double on the global market. Today, the Colombian emerald trade is engrained at the center of Colombia's civil conflict that has plagued the country since the 1950s.
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