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La Joya is a mesoamerican prehispanic archeological site , located in the municipality of Medellin , Veracruz in central Veracruz , Mexico , about 15 kilometers from the Veracruz City , near the confluence of the Jamapa and Cotaxtla Rivers .. Veracruz. Veracruz. Mexico. Mexico. The site , discovered and registered in 1935 , is known as `` La Joya de San Martin Garabato '' and comprises several earthen structures from an alleged early Olmec origin .. Remains of a continued human occupation throughout the classical period -LRB- 200 BCE -- 1000 CE -RRB- have been found -RRB- , about 95 % of the structures are destroyed by the common human carelessness and destruction .. This city probably was an important political center in Veracruz , similar to Cerro de las Mesas , with monumental stamped earthen architecture .. Veracruz. Veracruz. Two monumental platforms , apparently palatial residences , revealed a chronology during the first millennium CE , suggesting a well-organized society , providing new information on the Protoclassical -LRB- epi-Olmec -RRB- and Classical society .