The single loop earring is a common Native American style of earring and is found through out most tribes. The loops were frequently made using porcupine quills and seed beads or bird bones and seed beads. Sometimes the loops were made with just beads alone. Here are three examples. The first is constructed with porcupine quills and the second with spiny oyster shell. The third is a contemporary version made with 3mm turquoise heishi beads and sterling noodle tubes.