Chinese turquoise has a long history. The history of Chinese turquoise in the US market may be found in Chapter Five of Turquoise in America Part Two, 1910-1990.
 
This cabochon weighs 3.2 carats and measures 1cm in diameter. It is priced at $40 a carat or $128. It is not treated and backed. I have assigned a TG of 92 or GG. This turquoise has been tested by XRF at West Texas Analytical Lab and analyzed as Chinese although it was sold to me as Lander Blue.