Alexandrite

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Physical & Optical Properties

Mohs Hardness 8.5
Specific Gravity 3.69 – 3.81
Refractive Index 1.739 – 1.77
Crystal System Orthorhombic
Color various
Birefringence 0.007

Mohs Hardness

Mohs Hardness: 8.5
1 Soft10 Hard

Crystal System

a b c Orthorhombic a ≠ b ≠ c, α = β = γ = 90°

Value & Market

Price Tier Fine ($500-5,000/ct)

Cultural Significance

Birthstone Month 6 (modern)

About Alexandrite

Alexandrite is a phenomenal variety of chrysoberyl celebrated for its dramatic color change from emerald green in daylight to raspberry red under incandescent light, caused by chromium's unusual dual absorption of light. First discovered in Russia's Ural Mountains in 1830 and named after Tsar Alexander II, fine specimens are among the rarest and most valuable gemstones in the world. Today, significant sources include Brazil, Sri Lanka, and East Africa, but stones matching the original Russian standard remain extraordinarily rare.

Jewelry Use

Durability 9/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Alexandrite?
Alexandrite is a phenomenal variety of chrysoberyl celebrated for its dramatic color change from emerald green in daylight to raspberry red under incandescent light, caused by chromium's unusual dual absorption of light. First discovered in Russia's Ural Mountains in 1830 and named after Tsar Alexan
What is the hardness of Alexandrite?
Alexandrite has a Mohs hardness of 8.5, making it excellent for use in jewelry.
What color is Alexandrite?
Alexandrite is primarily Various.
Where is Alexandrite found?
Alexandrite is found in Ratnapura (Sri Lanka), Sri Lanka (Ceylon) (Sri Lanka).
How much does Alexandrite cost?
Alexandrite falls into the Fine ($500-5,000/ct) price range. Prices vary based on color, clarity, cut, and origin.

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