Zircons, often confused with man-made cubic zirconia, are natural gemstones which come in many colors. The colors for zircon are clear, blue, green, red, violet, brown and bronze. Zircons are found in Burma, Cambodia, Sri Lanka, Tanzania, and various African countries. Brown zircons are heated to create the blue varieties at 800 – 1000 degrees centigrade. Zircon has a Moh’s Hardness of 6.5 – 7.5 and is very brilliant with a high refractive index.