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Artemis Fine Arts' auction in Boulder, Colorado, presents a meticulously curated selection of 286 lots, bridging millions of years of natural and human history. Scheduled to begin live bidding on April 12, 2026, the event is headlined by extraordinary paleontological specimens, including a remarkably preserved fossilized Dinictis skull from the White River Formation and rare prehistoric crocodilian remains. In this image: North American Fossilized Juvenile Bison Antiquus Skull. Estimate: $1,500 - $2,500.

Five Miniature West African Wood Face Masks - Dan Ma Go. West Africa, Cote d'Ivoire and Liberia, Dan, Bassa, or Mano peoples, ca. early to mid-20th century CE. A compelling group of five miniature wood face masks, each carved in the refined idiom of the Dan and related peoples, where smooth planes, slit eyes, and softly modeled features suggest the deangle type - the graceful, feminine spirit of the forest. Estimate: $1,400 - $2,100.

Navajo Sterling Silver Concho Belt - 7 Large Conchos. Native American, Navajo (Dine), ca. 20th century CE. A commanding and substantial Navajo concho belt, formed of seven large, heavy silver conchos mounted on a leather strap, each disk finely worked in the classic repoussé tradition with radiating scalloped and geometric motifs, and secured on the verso with copper loops in a manner characteristic of later concho belt construction. Estimate: $1,500 - $2,250.

Spratling Sterling Silver & Ebony Pyramid Bracelet. Latin America, Mexico, ca. after 1979 CE. A Spratling sterling silver and ebony bracelet in the pyramid style, composed of fourteen rectangular silver panels with smooth, flat interiors and articulated hinges for flexibility. Estimate: $1,600 - $2,400.

Mississippian Pottery Whelk Shell Effigy Basin. Native American, Midwestern / Southeastern United States, Mississippian Caddo culture, ca. 1200 to 1400 CE. An intriguing pottery whelk shell effigy bowl, with pointed whorls that project outward, knobby spines along the body, and an elongated canal. Characteristic to Mississippian pottery, a shell-crushed temper was used, with visible white calcite inclusions. Estimate: $1,400 - $2,100.

Taino Stone Turtle Effigy - Zemi Form. Pre-Columbian, Caribbean, Taino culture, ca. 1000 to 1500 CE. A compact stone effigy in the form of a turtle, its rounded body resting low to the ground on subtly indicated limbs, with a projecting head carved in gentle, abstracted relief. The surface bears a mottled, speckled patina, its natural stone coloration enlivened by incised curvilinear motifs across the shell, suggesting both the patterned carapace of the animal and a symbolic language of movement and life. Estimate: $1,200 - $1,800.

Early Navajo Silver Profile Spoon Bracelet w/ Whirling Logs. Native American, southwest United States, Navajo people, ca. early 20th century CE. A finely crafted silver cuff bracelet animated by repeating whirling log motifs, or tsin naalwoli, a sacred Navajo symbol representing life, movement, and spiritual balance. The design is crisply stamped across the band, its rhythmic geometry evoking the four directions and the cyclical path of existence central to Navajo cosmology. Estimate: $1,200 - $1,800.

Caddo Hood Engraved Rattle Wolf & Duck Bowl. Native American, Southeastern United States, Mississippian, late to Historic Caddo, ca. 1400 to 1650 CE. A rare Caddo Hood Engraved effigy bowl, defined by its crisp horizontal engraved lines and animated by two sculpted rim heads that were made to rattle when handled. The vessel is formed as a deep, rounded bowl with a wide mouth and smooth, burnished surface, darkened by firing to a smoky charcoal-brown. Estimate: $1,500 - $2,500.

1980s African Papier-Mache Carnival Mask Devil. West Africa, Guinea-Bissau, ca. 1980s CE. A massive papier-mache carnival mask, crafted for pre-Lenten spring parades - a vibrant cultural tradition that blends local creativity with festive exuberance. Estimate: $900 - $1,350.

Mammoth Ivory, Fur, Woolly Rhino Tooth & Fern Fossil. Northern Asia, Russia, Siberia / North America, Alaska, Pleistocene (Ice Age), ca. 2.6 million to 10,000 years ago; North America, United States, Missouri, Pennsylvanian Age, ca. 323 million years ago. An assemblage of Ice Age megafauna material from woolly mammoth (Mammuthus primigenius) and woolly rhinoceros (Coelodonta antiquitatis), including tusk ivory fragments, a molar tooth, and preserved hair. Estimate: $900 - $1,500.