The spheres found in the Diquis Valley have different sizes (from 7 cm to 2.57 m in diameter); and their appearance goes from rough to polished. Hundreds of them have been found so far, and the archaeological excavations give evidence of the variety of contexts under which they were given different applications. The stone spheres are considered an example of human creative genius, artistic achievement, and craftsmanship of pre-Columbian societies.The sites are the physical remains of the complex political, social, and productive pre-Columbian societies based on hierarchical structures. The chiefdom inhabiting the Diquís’ Delta in Osa,created regional hierarchical colonies. In the same fashion, the colonies had their own internal social divisions of power centers.
In June 2014, several archaeological sites’ housing stone spheres within the Canton of Osa in Costa Rica were declared World heritage at the XXXVIII annual meeting of the World heritage committee, held in Doha, Qatar