Yungai is an area and a mine located in Hubei Provence, China. The story of the introduction of Chinese turquoise to the US market is told in Chapter Five of Turquoise in America Part Two 1910-1990 and in an article Turquoise in China Past and Present on the Blog of turquoiseinamerica.com.
 
This cab weighs 24.2 carat and measures 2.25cm X 2cm. It is priced at $60 a carat - $1452. It is not treated and not backed. I have assigned a TG of 93 or GG. Blue Flower is the highest grade of Chinese turquoise. I purchased this stone from Yuki Wang and cut the cab myself.