Bisbee is a famous turquoise mine from Arizona. The history is told in Turquoise in America Part Two, 1910-1990.
 
These cabochons weigh 7 carats and measure 1.5cm X 0.75cm each. They are not treated and backed. They are priced at $200 a carat or $1400. I have assigned a TG of 94 or GG. I bought these from Bruce Mead.