A rare stone from the old mines at Los Cerrillos, New Mexico, set in Mammoth ivory.
Gemstone contains turquoise, malachite, quartz, cuprite, copper, azurite (the deep blue). Here’s a larger, sharper picture:
Here’s another sample of turquoise from Cerrillos, at the Smithsonian:
By Tim Evanson from Washington, D.C., United States of America – Turquoise – Smithsonian Museum of Natural History – 2012-05-17
Uploaded by PDTillman, CC BY-SA 2.0, Link