Hidden Valley comes from an unknown mine probably high graded in the Candelaria Hills. The story is found in Turquoise in America Part Two, 1910-1990.
 
This cab weighs 20.8 carat and measures 2cm X 2cm X 8mm. It is priced at $10 a carat or $208. It is not treated and is backed. I have assigned a TG of 75 or HMG. This stone was cut by and purchased from Wayne Nelson. White spot is camera flash.