Carico Lake turquoise is from the Aurora claim located in the Carico Lake Valley of Lander County Nevada. The history is found in Turquoise in America Part Two, 1910-1990.
 
This cabochon weighs 17.1 carats and measures 2.5cm X 1.75cm. It is priced at $50 a carat or $855. It is not treated and is backed. I have assigned a TG of 88 or VHG. This stone comes from the Nevada Gem Collection and is pictured in the book Turquoise, Jewell of the Southwest. The white spot is camera flash.