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 eight stones of Kingman weigh 77 carats and measure on average 1.5cm X 1.5cm. They are not treated and are backed. The retail price for this grade is $60 a carat. These are priced at wholesale discount at $35 a carat or $2,695.I have assigned a TG of 85 VHG. These come from the Wayne Nelson Collection and were purchased by Wayne Nelson during the mid-eighties in Kingman.
The white spots in the photo are from camera flash.