Kingman HG from the Callais Collection
 
Kingman is a famous turquoise from Arizona. The history is told in Turquoise in America Parts One and Two.
 
This cabochon weighs 13.9 carats and measures 2cm C 1.5cm.It is priced at $40 a carat or $556. It is not treated and backed. I have assigned a TG of 81 or HG.