Sounds simple enough to me. Take a concha (concha is correct rather
than the erroneous word “concho” which has come into wide usage).
Anyway, take a concha and solder a clip onto the back with an
extended stem having a loop in the end. Now, to make the concha
itself, well, that’s another matter.
A detailed explanation of that procedure can be found in the book
"Indian Silversmithing" by W. Ben Hunt which I believe is still
avaiable from Amazon.
Jerry in Kodiak