Semi-Precious Stones · uncommon
Topaz
Topaz is an aluminum silicate mineral prized for its hardness and brilliant colors. Imperial topaz (orange-pink) from Brazil is most valuable.
Also known as: november birthstone, imperial topaz, blue gem.
Topaz properties at a glance
| Type | Semi-Precious Stones |
|---|---|
| Chemical formula | Al2SiO4(F,OH)2 |
| Mohs hardness | 8 |
| Crystal system | orthorhombic |
| Luster | vitreous |
| Streak | White |
| Cleavage | Perfect basal |
| Fracture | Conchoidal |
| Specific gravity | 3.5 |
| Transparency | transparent |
| Common colors | Colorless, Blue, Yellow, Orange, Pink |
| Rarity | uncommon |
Geology & background
Forms in cavities of igneous rocks, particularly granite and rhyolite pegmatites, from fluorine-bearing vapors.
The Greeks believed topaz could make its wearer invisible; Romans associated it with Jupiter.
How to identify Topaz
- Check whether the specimen's color and texture match typical Topaz 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 Topaz identification guide: checklist, home tests and look-alikes →
Topaz vs similar stones
Not sure it isn't something else? Side-by-side comparisons with the stones most often confused with Topaz.
Where Topaz is found
Topaz is reported from multiple localities or geological settings. Exact locality should be verified from specimen provenance, maps, or field notes.
How much is Topaz worth?
| Entry-level specimen | $20 |
|---|---|
| Typical collector specimen | $100 |
| Premium specimen | $3000+ |
Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.
Common uses
- Jewelry
- Collector specimens
Interesting facts
- The largest cut topaz is the 'El-Dorado Topaz' at 31,000 carats
- Most blue topaz is colorless topaz that's been irradiated
- Ancient Greeks believed it gave them strength
Care & safety
Treat Topaz 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.
Topaz FAQ
What is Topaz?
Topaz is an aluminum silicate mineral prized for its hardness and brilliant colors. Imperial topaz (orange-pink) from Brazil is most valuable.
How much is Topaz worth?
Entry-level Topaz specimens sell for around $20, a typical collector specimen for about $100, and premium pieces for $3000 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 Topaz?
Topaz has a Mohs hardness of 8. It scratches glass, steel and even quartz; only harder gems will mark it.
Where is Topaz found?
Notable sources of Topaz include Brazil, Pakistan, Russia, USA, and Sri Lanka. Forms in cavities of igneous rocks, particularly granite and rhyolite pegmatites, from fluorine-bearing vapors..
What is Topaz used for?
Topaz is used for jewelry and collector specimens.
