Carico Lake is a famous turquoise mine of Nevada. The history is told in Turquoise in America Part Two, 1910-1990.
 
These cabochons weigh 3.6 carats and measure 1cm X 0.5cm each. They are priced at $50 a carat or $180. They are not treated and backed. I have assigned a TG of 90-91 or VHG-GG.