Vintage Rare Turquoise Sterling Silver Navajo Earrings 925 Chris Billie

I would say the turquoise is old Demele, but without provenance I cannot be sure. It is a rare green spiderweb turquoise (most likely Nevada) in vintage/antique clip earrings. I have left the great patina on the sterling. Signed by Navajo artist. See pictures as part of the description.