Precious Stones · epic
Alexandrite
Alexandrite is a rare color-changing variety of chrysoberyl that appears green in daylight and red under incandescent light. It's one of the rarest gemstones.
Also known as: color change, june birthstone, russian gem.
Alexandrite properties at a glance
| Type | Precious Stones |
|---|---|
| Chemical formula | BeAl2O4 |
| Mohs hardness | 8.5 |
| Crystal system | orthorhombic |
| Luster | vitreous |
| Streak | White |
| Cleavage | Good |
| Fracture | Conchoidal |
| Specific gravity | 3.7 |
| Transparency | transparent |
| Common colors | Green in daylight, Red in incandescent light |
| Rarity | epic |
Geology & background
Forms in pegmatites and metamorphic rocks where beryllium, aluminum, and chromium are present.
Discovered on the future Tsar Alexander II's birthday, it became Russia's national stone.
How to identify Alexandrite
- Check whether the specimen's color and texture match typical Alexandrite 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 Alexandrite identification guide: checklist, home tests and look-alikes →
Alexandrite vs similar stones
Not sure it isn't something else? Side-by-side comparisons with the stones most often confused with Alexandrite.
Where Alexandrite is found
Alexandrite is reported from multiple localities or geological settings. Exact locality should be verified from specimen provenance, maps, or field notes.
How much is Alexandrite worth?
| Entry-level specimen | $5000 |
|---|---|
| Typical collector specimen | $15000 |
| Premium specimen | $70000+ |
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
- Called 'emerald by day, ruby by night'
- Discovered in Russia's Ural Mountains in 1830
- Named after Russian Tsar Alexander II
Care & safety
Treat Alexandrite 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.
Alexandrite FAQ
What is Alexandrite?
Alexandrite is a rare color-changing variety of chrysoberyl that appears green in daylight and red under incandescent light. It's one of the rarest gemstones.
How much is Alexandrite worth?
Entry-level Alexandrite specimens sell for around $5000, a typical collector specimen for about $15000, and premium pieces for $70000 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 Alexandrite?
Alexandrite has a Mohs hardness of 8.5. It scratches glass, steel and even quartz; only harder gems will mark it.
Where is Alexandrite found?
Notable sources of Alexandrite include Russia, Brazil, Sri Lanka, Tanzania, and Madagascar. Forms in pegmatites and metamorphic rocks where beryllium, aluminum, and chromium are present..
What is Alexandrite used for?
Alexandrite is used for jewelry and collector specimens.
