Villa Grove is a famous turquoise mine in Colorado. The story is told in Turquoise in America Part Two, 1910-1990.
 
This cab weighs 66.4 carats and measures 4.5cm X 3.5cm. It is not treated and unbacked. It is priced at $6 a carat or $396. I have assigned a TG of 78.5 or HMG High Mid-Grade. I purchased this stone from Dennis June a well know turquoise and Indian art dealer in Scottsdale. The Villa Grove mine is currently under water and it is unlikely that turquoise will be mined in the future.