Gemstone profile and identification guide
Zircon
Zircon is a natural zirconium silicate gemstone known for high dispersion and brilliance.
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Overview
Zircon is a natural zirconium silicate gemstone known for high dispersion and brilliance.
Did you know? Natural zircon is unrelated to cubic zirconia, which is a synthetic material.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Identification
Name: Zircon
Scientific classification: Silicate (Nesosilicate: Zircon)
Hardness: 7.5 Mohs
Transparency: transparent
Lustre: adamantine to vitreous
Crystal system: Tetragonal
Primary colour: Colorless
Secondary colour: Blue
Colour family: Whites & Neutrals
High birefringence causing facet doubling is a key zircon identifier.
Verification Status
Status: verified-core-fields
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity, locality, and physical-property fields reviewed against standard gemological references.
Final remaining profile set completed in targeted pass.
Physical Properties
Hardness category: hard
Hardness value: 7.5 Mohs
Chemical composition: Zirconium silicate (ZrSiO4)
Crystal system: Tetragonal
Common locations: Cambodia, Sri Lanka, Myanmar, Tanzania, Australia
Learn more: Gem-A gemstone education resources.
Colour Variations
High-brilliance zircon species in multiple body colors.
Optical effects: Strong Fire
Detailed Gemology
Mineral species: Zircon
Mineral group: Zircon group
Chemical formula: Zirconium silicate (ZrSiO4)
Mohs hardness: 7.5
Crystal system: Tetragonal
Lustre: adamantine to vitreous
Transparency: transparent
Streak: White
Cleavage: Variable by species/material
Fracture: Conchoidal to uneven
Specific gravity: 3.9-4.7 (structure-dependent)
Refractive index: 1.81-2.02
Optical phenomena: Facet doubling and strong fire
Colour range: Colorless, blue, yellow, brown, red
Common inclusions: Species-dependent inclusions and growth features
Geological environment: Species-dependent
Principal mining regions: Cambodia, Sri Lanka, Myanmar, Tanzania, Australia
Important commercial sources: Gem zircon is sourced from alluvial and igneous/metamorphic-hosted deposits
Historical significance: Recognized in gemological and lapidary trade.
Common treatments: Heat treatment common for color modification.
Synthetic or imitation forms: Imitations may exist depending on species.
Common look-alikes: Species-dependent look-alikes.
Jewellery uses: Used in fine faceted jewelry as a natural high-fire gemstone.
Care recommendations: Reasonably hard but can abrade at facet edges; avoid knocks and harsh ultrasonic use.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Zircon.
Formation
Forms in igneous and metamorphic rocks and persists in alluvial placers due to durability.
Origin
Gem zircon is sourced from alluvial and igneous/metamorphic-hosted deposits
Uses
Best for: Used in fine faceted jewelry as a natural high-fire gemstone.
Ideal uses: Brilliant faceted center stones with protective setting.
Care
Reasonably hard but can abrade at facet edges; avoid knocks and harsh ultrasonic use.
Need another candidate? Use advanced gemstone search or return to the identification guide.
Related gemstones by colour
Related gemstones by hardness
Commonly confused gemstones
Zircon FAQ
How can I identify Zircon?
Compare hardness (7.5 Mohs), crystal system (Tetragonal), colour profile, and lustre (adamantine to vitreous) with your sample. Then cross-check related gemstones listed above.
What colour range does Zircon appear in?
High-brilliance zircon species in multiple body colors.
Where is Zircon commonly used?
Brilliant faceted center stones with protective setting.. For maintenance, follow the care guidance in this profile.
Scientific References
GIA: general gemstone identity (reviewed) - Batch 10 factual verification pass.
Gem-A: gemological terminology and testing references (reviewed) - Batch 10 factual verification pass.
Mindat: mineral species and principal localities (reviewed) - Batch 10 factual verification pass.
International Gem Society: gem trade context and treatment overview (reviewed) - Batch 10 factual verification pass.