Lone Mountain is one of the seven classic turquoise mines of Nevada. The history of Lone Mountain is told in Turquoise in America Part Two, 1910-1990.
 
This cabochon weighs 14.3 carats and measures 2cm X 1.5cm. It is not treated and is backed. It is priced at $100 a carat or $1430. I have assigned a TG of 91 or GG, Gem Grade. I bought this stone from Wayne Nelson.