These arching figures are readily associated with American Indian imagery.
There is a new book recently published by Schiffer titled Knifewing and Rainbow Man in Zuni Jewelry.
These two Zuni jewelers are known for their meticulous inlay work, often depicting birds and rainbow men.
A ring by Quinton Quam Sr. is illustrated on page 17 of Zuni Jewelry by Theda and Michael Bassman.