Indian Mountain is one of the classic turquoise mines of Nevada. The history is told in Turquoise in America Part Three, 1910-2020.
 
This cabochon weighs 8.3 carats and measures 2cm X 1.5cm. It is priced at $80 a carat or $664. It is not treated and backed. I have assigned a TG of 93 or GG.