Dubbed "Green Gold," Dioptase is perhaps second only to Emerald in expressing the finest shades of green that Nature has to offer! While a challenge to photograph and capture its truest color, Dioptase will always hold a place in any major mineral collection. It's just too green to be true! Popular localities include Tsumeb (the finest!), Kazakhstan, DR Congo, Kaokaveld Namibia, Brassville Congo, and Argentina.