Archaeologists conduct project to conserve Costa Rica’s stone spheres

A team from the National Institute of Anthropology and History (INAH), and the National School of Conservation, Restoration and Museography (ENCRyM), have undertaken a project to conserve Costa Rica’s stone spheres.

Over 300 stone Petrospheres, often referred to as the Diquís Spheres, have been found on the small island of Isla del Caño and the Diquís Delta in Costa Rica.

- Advertisement -

The spheres are attributed to the now extinct Diquís culture, a people that first emerged in the Valley of the Rio Grande de Térraba during the Synancra period around 1,500 to 300 BC.

Between AD 800 to 1,500, the culture reached its apex of cultural development – with Diquís artisans creating elaborate ceramic, bone, and gold objects, and sculpturing stone spheres that were placed in important zones and places of alignments in public plazas.

The Diquís Spheres vary in size, spanning from a few centimetres to over 2 meters in diameter. The spheres are predominantly crafted from gabbro, a phaneritic mafic intrusive igneous rock resembling basalt, but there are also instances where limestone and sandstone are used.

The process of sculpting these spheres involved hammering boulders into a rough spherical shape using denser rocks, then meticulously polishing using sand to achieve a smooth finish.

- Advertisement -

According to the researchers: “The importance of these spheres constitutes elements of identity for many indigenous communities in Costa Rica, and are the only cultural asset that the country has inscribed on the World Heritage List of the United Nations Educational, Scientific and Cultural Organisation (Unesco).”

Based on studies carried out on the largest stone spheres, experts from the ENCRyM and the National Museum of Costa Rica have investigated the materiality of these cultural assets to optimise their conservation treatments, assess the cultural significance of the sites, and to protect the cultural heritage for future generations.


Header Image Credit : Shutterstock

- Advertisement -
Mark Milligan
Mark Milligan
Mark Milligan is multi-award-winning journalist and the Managing Editor at HeritageDaily. His background is in archaeology and computer science, having written over 7,500 articles across several online publications. Mark is a member of the Association of British Science Writers (ABSW), the World Federation of Science Journalists, and in 2023 was the recipient of the British Citizen Award for Education, the BCA Medal of Honour, and the UK Prime Minister's Points of Light Award.

Mobile Application


Related Articles

Archaeologists search crash site of WWII B-17 for lost pilot

Archaeologists from Cotswold Archaeology are excavating the crash site of a WWII B-17 Flying Fortress in an English woodland.

Roman Era tomb found guarded by carved bull heads

Archaeologists excavating at the ancient Tharsa necropolis have uncovered a Roman Era tomb guarded by two carved bull heads.

Revolutionary war barracks discovered at Colonial Williamsburg

Archaeologists excavating at Colonial Williamsburg have discovered a barracks for soldiers of the Continental Army during the American War of Independence.

Pleistocene hunter-gatherers settled in Cyprus thousands of years earlier than previously thought

Archaeologists have found that Pleistocene hunter-gatherers settled in Cyprus thousands of years earlier than previously thought.

Groundbreaking study reveals new insights into chosen locations of pyramids’ sites

A groundbreaking study, published in the journal Communications Earth & Environment, has revealed why the largest concentration of pyramids in Egypt were built along a narrow desert strip.

Soldiers’ graffiti depicting hangings found on door at Dover Castle

Conservation of a Georgian door at Dover Castle has revealed etchings depicting hangings and graffiti from time of French Revolution.

Archaeologists find Roman villa with ornate indoor plunge pool

Archaeologists from the National Institute of Cultural Heritage have uncovered a Roman villa with an indoor plunge pool during excavations at the port city of Durrës, Albania.

Archaeologists excavate medieval timber hall

Archaeologists from the University of York have returned to Skipsea in East Yorkshire, England, to excavate the remains of a medieval timber hall.