Other
Gem Hut: Zircon
This commercial page gives information about the physical properties of zircon, its appearance, and where it can be found. Includes pictures and tables.
Jewelry Central
Jewelry Central: Zircon
This commercial site contains information on zircon including its history, physical and metaphysical properties, and where it can be found.
Other
International Colored Gemstone Association: Zircon
This page contains interesting facts on zircon, including its history, physical properties, and place of origin. Good informational site on this gemstone.