Gemological information

Gemological information for Zircon
Color Colorless, Blue, Yellow, Orange, Brown, Violet & Red
Crystal Structure Tetragonal - 4 sided prisms with pyramidal terminals
Refractive Index high stones = 1.777 - 1.987
Durability Fair to good, this decreases with heat treatment
Hardness 6.5 to 7.5
Similar stones Spessartite, Sphene, Andradite, Sphalerite, Topaz, Tourmaline, Synthetic Rutile, Diamond & Strontiium Titanate
Treatments Heat Treatment to change color
Country of origin Sri Lanka, Myanmar, Cambodia, Thailand & Australia
Ultrasonic cleaning Not safe
Steam cleaning Not safe
Warm soapy water Safe
Chemical attack Avoid
Light sensitivity Heat treated stones may return to their original color
Heat sensitivity May change color