Chunky multi color natural turquoise cabochon (Stone Mountain Turquoise) Instagram $70.50 for 18.1 carats un-backed & untreated Nevada turquoise. nvctadmin From the Lapidary Shop, Uncategorized Comments Chunky multi color natural turquoise cabochon (Stone Mountain Turquoise) Instagram $70.50 for 18.1 carats un-backed & untreated Nevada turquoise.