Zircon is zirconium silicate, tetragonal, hardness 7.5. Colorless, blue, and honey stones are cut for jewelry. It is not cubic zirconia, which is a laboratory material.
This page is only for Zircon. Comments below are for this material.
Wikimedia Commons
Zircon
Specimen Details
- Hardness (Mohs): 7.5
- Chemical Formula: ZrSiO4
- Crystal System: Tetragonal
- Size: Specimen size varies; record the piece, not the species