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Zircon
Zircon is nesosilicate, ZrSiO₄. In the hand, it rates 7.5 on the Mohs scale, and it runs honey brown and red-brown. Brilliant fiery gem with extreme density and strong doubling, look through the table and back facet edges appear twinned. Notable: Cambodia (Ratanakiri blue), Sri Lanka, Tanzania, Australia.
The geology.
Zircon carries the formula ZrSiO₄. It belongs to the tetragonal system. The trade files it under nesosilicate.
It sits at 7.5 on the Mohs scale. The surface reads adamantine to vitreous. Light behaviour is transparent to translucent. Specific gravity runs 4.6 to 4.7. The streak is white. It breaks with indistinct cleavage; conchoidal fracture.
Brilliant fiery gem with extreme density and strong doubling, look through the table and back facet edges appear twinned.
Common cuts are faceted, small tetragonal prisms or tumbled.
The origins.
Notable: Cambodia (Ratanakiri blue), Sri Lanka, Tanzania, Australia.
On value, the database notes: mid-range; fine Cambodian blue is prized.
Traditional associations.
In energy work traditions, associated with grounding ambition and self-confidence.
Included for completeness. Tradition is worth knowing about, and it is worth keeping separate from the mineralogy.
Spotting the real thing.
Brilliant fiery gem with extreme density and strong doubling, look through the table and back facet edges appear twinned.
Constantly confused with cubic zirconia by name; nearly all blue zircon is heated (accepted); some zircon is mildly radioactive ('low' zircon), jewelry-grade is safe.
| Looks like | How to tell them apart |
|---|---|
| Cubic zirconia | Different material entirely: CZ is man-made zirconium oxide, singly refractive (no doubling); zircon is a natural silicate |
| Diamond | Zircon's facet-edge doubling gives it away, diamond shows single crisp edges |
| Topaz | Less fire, lower density |
At-home tests.
These checks cost nothing. Daylight, a 10x loupe and a little patience are the whole kit for zircon.
| Test | What you should see |
|---|---|
| Under a loupe | Facet doubling under a loupe (high birefringence) |
| By weight | Extreme heft (SG 4.7, among the densest gems) |
| By eye | Adamantine sparkle |
Anything that scratches, burns or dissolves the piece is a lab job. Get it appraised rather than testing it apart.
Care & handling.
At 7.5 on the Mohs scale it stands up to everyday wear. It will still chip on a hard knock, so treat edges and points with respect.
It breaks with indistinct cleavage; conchoidal fracture, which is worth knowing before you set it or drop it.
Warm water and a soft cloth clean almost everything. Ultrasonic tanks, steamers and household cleaners are where pieces get ruined.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is ZrSiO₄. Crystal system: Tetragonal. Specific gravity: 4.6 to 4.7. Streak: White. Cleavage and fracture: Indistinct cleavage; conchoidal fracture.
How it reaches the market
Notable: Cambodia (Ratanakiri blue), Sri Lanka, Tanzania, Australia.
What it gets confused with
Cubic zirconia: Different material entirely: CZ is man-made zirconium oxide, singly refractive (no doubling); zircon is a natural silicate. Diamond: Zircon's facet-edge doubling gives it away, diamond shows single crisp edges. Topaz: Less fire, lower density.
What it is worth
Mid-range; fine Cambodian blue is prized.
Where buyers get caught
Constantly confused with cubic zirconia by name; nearly all blue zircon is heated (accepted); some zircon is mildly radioactive ('low' zircon), jewelry-grade is safe.
One more thing
Tiny zircons from Jack Hills, Australia are 4.4 billion years old, the oldest known pieces of Earth, older than the oceans.
An education-first guide.
No product links here. We do not sell zircon, and a guide that only covers our own shelves would not be much of a guide.
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