Semi-Precious Stones · uncommon
Zircon
Zircon is one of the oldest minerals on Earth, with some crystals over 4 billion years old. Not to be confused with synthetic cubic zirconia.
Also known as: december birthstone, oldest mineral, blue zircon.
Zircon properties at a glance
| Type | Semi-Precious Stones |
|---|---|
| Chemical formula | ZrSiO4 |
| Mohs hardness | 7.5 |
| Crystal system | tetragonal |
| Luster | adamantine |
| Streak | White |
| Cleavage | Imperfect |
| Fracture | Conchoidal |
| Specific gravity | 4.6 |
| Transparency | transparent |
| Common colors | Colorless, Blue, Red, Yellow, Green, Brown |
| Rarity | uncommon |
Geology & background
Forms in igneous rocks during crystallization of magma. Very resistant to weathering, so found in sediments.
Zircon crystals from Australia are the oldest known terrestrial material, providing windows into early Earth.
How to identify Zircon
- Check whether the specimen's color and texture match typical Zircon examples.
- Photograph a fresh surface in natural light and avoid shadows, glare, or wet surfaces.
- Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.
Full Zircon identification guide: checklist, home tests and look-alikes →
Zircon vs similar stones
Not sure it isn't something else? Side-by-side comparisons with the stones most often confused with Zircon.
Where Zircon is found
Zircon is reported from multiple localities or geological settings. Exact locality should be verified from specimen provenance, maps, or field notes.
How much is Zircon worth?
| Entry-level specimen | $50 |
|---|---|
| Typical collector specimen | $200 |
| Premium specimen | $2000+ |
Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.
Common uses
- Jewelry
- Nuclear industry
- Scientific dating
Interesting facts
- Earth's oldest material - some crystals are 4.4 billion years old
- NOT the same as synthetic cubic zirconia
- High refractive index gives it diamond-like brilliance
Care & safety
Treat Zircon as a collector specimen unless hardness, cleavage, and fracture are confirmed.
Avoid inhaling dust. Do not cut, grind, or polish unknown specimens without eye protection and a properly rated respirator.
Zircon FAQ
What is Zircon?
Zircon is one of the oldest minerals on Earth, with some crystals over 4 billion years old. Not to be confused with synthetic cubic zirconia.
How much is Zircon worth?
Entry-level Zircon specimens sell for around $50, a typical collector specimen for about $200, and premium pieces for $2000 or more. Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.
How hard is Zircon?
Zircon has a Mohs hardness of 7.5. It scratches glass, steel and even quartz; only harder gems will mark it.
Where is Zircon found?
Notable sources of Zircon include Cambodia, Sri Lanka, Myanmar, Australia, and Tanzania. Forms in igneous rocks during crystallization of magma.
What is Zircon used for?
Zircon is used for jewelry, nuclear industry, and scientific dating.
