Cheyenne, formerly known as Hidden Treasure and Carrie, has a long history which may be found in Turquoise in America Part Two 1910-1990.
 
This cabochon weighs 13.1 carats and measures 2.5cm X 1.75cm. It is priced at $40 a carat or $524. It is not treated and backed. I have assigned a TG of 81 or HG. I bought this stone from Jesse Robbins.