Shell gorget

Shell gorgets are a Native American art form of polished, carved shell pendants worn around the neck. The gorgets are frequently engraved, and are sometimes highlighted with pigments, or fenestrated (pierced with openings).

Shell gorgets were most common in Eastern Woodlands of the United States, during the Hopewell tradition (200 BCE– 500 CE) and Mississippian cultural period (ca. 800–1500 CE); however, tribes from other regions and time periods also carved shell gorgets. The earliest shell gorgets date back to 3000 years BP. They are believed to have been insignia of status or rank, either civic, military, or religious, or amulets of protective medicine. Due to the placement of the holes in the gorgets, they are also thought to be spinners that could produce whistling sounds.

Lightning whelk (Busycon contrarium) is the most common shell used for gorgets. Other shells, such as the true conch or Strombus, as well as freshwater mussels, are also carved into gorgets. Today, due to environmental causes, harvested lightning whelks are significantly smaller than in precontact times. These earlier shells typically ranged from 6 to 12 inches in length.

Harvested off the coasts of Florida and the Gulf of Mexico, the shells were traded through the Eastern Woodlands. This native trade continued into the 16th century.

Gorgets are carved from the penultimate whorl of the shell. A blank is cut or broken out, then ground smooth. Holes for suspension and decoration are drilled, sometimes with a bow drills or chert drills. The gorget forms a concave shape and, when engraved, the interior is polished and decorated.

...
Wikipedia