Lone Mountain is one of the seven classic turquoise from Nevada. The story is found in Turquoise in America Part Two, 1910-1990
 
This stone weighs 5.4 carats and measures 1.75cm X 1cm. It is not treated and is backed. The price is $150 a carat or $810. I have assigned a TG of 94 or GG. This cab comes from the personal collection of Charles Loloma. I purchased this from the estate of Georgia Loloma. White spot is camera flash.