Zircon is the most brilliant blue gemstone. Customers sometimes confuse it with cubic zirconia, a synthetic diamond simulant. Zircon is a natural mineral, zirconium silicate, and is found in a range of colors, including white, blue, yellow, orange, brown, rose and green.
Blue Zircon, the most popular color, is produced by heat treatment of brown zircon though not all brown zircon will turn blue when heated. Most blue zircon comes from Cambodia or Burma.