Turquoise has been mined in the Kingman area for over one hundred years. The story is told in Turquoise in America Parts 1-3. Dark web spiderweb was first recognized on Ithaca Peak and has been a distinctive Kingman look, very rare as natural.
 
These six stones of Kingman weigh 52.7 carats and measure on average 1.5cm X 1.5cm. They are not treated and are backed. The retail price for this grade is $50 a carat. These are priced at wholesale discount at $25 a carat or $1,317. I have assigned a TG of 79 HMG. These come from the Wayne Nelson Collection and were purchased by Wayne Nelson during the mid-eighties in Kingman.
White spots in photo are from camera flash.