Carico Lake is the marketing name for turquoise from the Aurora claim located in Carico Lake Valley Nevada. The story is told in Turquoise in America Part Two, 1910-1990
 
This cabochon weighs 58.3 carats and measures 4 cm X 2.75cm X 1cm. It is priced at $20 a carat or $1166. It is not treated and is backed. This is a large cabochon with a high dome. I have assigned a TG of 86 or VHG. This stone comes from the Nevadagem Collection. The white spot is camera flash.