Tyrone is the marketing name for turquoise mined from the old Azure claims near Silver City NM. The story is told in Turquoise in America Part One and Part Two.
 
This cabochon weighs 9.0 carat and measures 2cm X 1cm X 4mm. The price is $80/ct or $720. It is not treated and is backed. I have assigned a TG of 84 or HG. I purchased this stone from the Bruce Mead. White spot is camera flash.