Persian turquoise has a long history. It was the first turquoise to be mined as early as 7000 BCE. While the mines are located in Iran the turquoise is known as Persian.
 
This cabochon weighs 24.9 carats and measures 2cm X 1.25cm. It comes from the Nishapur area. It is not treated, not backed and cut in the Persian high dome manner. The cab is priced at $60 a carat or $1494. I have assigned a TG of 85 or VHG. I purchased this stone from Shahriyar Zamansani.