New Mexico — The Cerrillos Turquoise Tradition and Other Gem Sources
New Mexico — The Cerrillos Turquoise Tradition and Other Gem Sources
One of North America's oldest gem-producing regions, with turquoise mined by ancestral Puebloan peoples for over a thousand years
New Mexico is the southwestern American state with the longest documented history of gemstone production in North America, on the strength of the Cerrillos turquoise district and the broader cultural tradition of turquoise mining and use among the ancestral Puebloan, Navajo, and Hopi peoples of the region. The Cerrillos workings, in the Cerrillos Hills south of Santa Fe, have produced turquoise continuously from at least the eighth century CE, and the material was distributed through pre-Columbian trade networks reaching from the Hohokam settlements of present-day Arizona into central Mexico, where Cerrillos turquoise has been recovered archaeologically from Aztec ceremonial contexts in Tenochtitlan. Beyond Cerrillos, New Mexico has minor production of agate, peridot, garnet, topaz, and a number of other gem species, but turquoise is the gemmological signature of the state.
Cerrillos and the pre-Columbian tradition
The Cerrillos Hills lie approximately twenty-five kilometres south of Santa Fe, in a low range of hills hosting copper-mineralised volcanic and sedimentary rocks. Turquoise occurs in the oxidised zone of the copper system, as veins, nodules, and crusts in association with the alteration of copper-bearing host rocks. The mineralogy is the standard turquoise paragenesis: a hydrated copper-aluminium phosphate, CuAl6(PO4)4(OH)8·4H2O, with the colour ranging from sky blue through blue-green to apple green depending on iron substitution.
The pre-Columbian workings at Cerrillos and the related Tiffany Mine, Castilian Mine, and Mount Chalchihuitl extend over substantial areas, with archaeological evidence of mining technology including stone hammers, antler picks, and the use of fire-setting (heating the rock face and quenching with water to induce fracture). The volume of pre-Columbian production is difficult to estimate precisely but is large enough to be visible in the surviving workings and in the archaeological record of distribution.
Cerrillos turquoise was traded into the Hohokam, Mogollon, and Anasazi cultures of the American Southwest and onward into Mesoamerica through the long-distance trade networks centred on Casas Grandes (Paquimé) in Chihuahua. Stone-by-stone trace-element fingerprinting has been used in archaeological provenance studies to confirm the Cerrillos origin of turquoise recovered from Aztec contexts in Tenochtitlan, including pieces incorporated into the famous turquoise mosaics now in the British Museum and the Museo del Templo Mayor.
The Tiffany period
European-American mining at Cerrillos began in the 1880s, and Tiffany & Co. of New York became one of the principal commercial purchasers of Cerrillos turquoise during the 1890s and into the early twentieth century. The American Turquoise Company, in which Tiffany held an interest, operated the Tiffany Mine in the Cerrillos Hills and supplied a substantial portion of the turquoise that the Tiffany silver and goldsmithing operations used during the Art Nouveau and early twentieth-century period. The commercial mining declined in the early twentieth century as the easily worked deposits were exhausted, and modern production from the Cerrillos district is small in volume.
Other turquoise localities in New Mexico
Beyond Cerrillos, New Mexico has historic and minor current turquoise production from a number of localities including the Tyrone Mine in Grant County, the Hachita district, the Burro Mountains, and the Jarilla Mountains in Otero County. None of these matches Cerrillos in cultural or commercial significance, but each has produced material of jewellery quality at various periods. The Hachita and Tyrone material is sometimes traded as Royston-style or Burnham-style green turquoise, and the trade names vary by dealer.
Other gem species
Peridot from the Kilbourne Hole maar in southern New Mexico — a volcanic crater with peridot-bearing mantle xenoliths — produces small but well-coloured crystals of gem-quality peridot, principally for the lapidary and collector market rather than for major commercial use. Garnet, agate, jasper, and topaz are reported from various pegmatite and hydrothermal occurrences, and a small turquoise-and-azurite combination locality at the Apache Canyon area produces specimens of mineralogical interest.
The Native American jewellery tradition
The pre-Columbian use of turquoise in the New Mexican Pueblo, Navajo, and related cultures continued and developed through the colonial and modern periods, and contemporary Native American jewellery from New Mexico — particularly Navajo and Pueblo silver-and-turquoise work — represents one of the most distinctive regional jewellery traditions in North America. The contemporary tradition draws on Cerrillos and other regional turquoise alongside material imported from Arizona, Nevada, and Mexico, and the silverwork is principally in coin silver and sterling silver, with the introduction of European silver fabrication techniques (sand-casting, stamp-work) into the older bead-and-mosaic Pueblo tradition during the late nineteenth century.
Major Native American jewellery centres in New Mexico include Zuni Pueblo (known for fine inlay and needlepoint work), Santo Domingo (Kewa) Pueblo (known for shell-and-turquoise heishi beadwork), and the Navajo communities surrounding Gallup and Window Rock. Authentication and dating of historic and contemporary Native American jewellery is a substantial specialist field, with the Indian Arts and Crafts Act of 1990 providing the federal regulatory framework for authenticity disclosure in the United States.
In the trade
Cerrillos turquoise from authenticated New Mexican production trades at premiums in the southwestern American jewellery and collector market, with the cultural and historical association adding meaningfully to the value of well-documented pieces. Modern production is small, and most material currently in commerce as Cerrillos is from older accumulations rather than from current mining. Buyers should be alert to misattribution: turquoise from many other localities is sometimes traded under the Cerrillos name, and a documented chain of custody back to the Cerrillos workings is the only reliable provenance.
For Native American jewellery, the Indian Arts and Crafts Act framework provides a federal protection against the misrepresentation of imported or non-Native work as Native American, and reputable trade in the field works within that framework with explicit disclosure.