Stone Guide
Alexandrite
Origin: Ural Mountains, Russia (also Brazil, Sri Lanka, East Africa)
What Makes It Special
Alexandrite is the ultimate geological magic trick—it is the only gemstone that fundamentally changes its daylight color to a completely different hue under incandescent light. Mined originally in Russia in the 1830s, it owes its freakish properties to a rare trace of chromium—the exact same element that makes emeralds green and rubies red. The stone balances perfectly between these two states: emerald by day, ruby by night. Fine alexandrite with a 100% complete color change is rarer than top-tier fancy color diamonds.
Required Documentation
The color change description in the report is critical — it should describe the daylight color AND the incandescent color specifically. Strong color change is premium; weak or moderate is discounted significantly.
Price Guide 2026
⚠️ Alexandrite is rarely treated. Most value factors relate to color change strength and origin rather than treatment.
Notable Auction Records
Russian alexandrite, 27.85ct, strong color change
Christie's Geneva 2014
$1.47M
$52,800/ct
Russian alexandrite ring, 8.71ct
Sotheby's New York 2019
$320,000
$36,700/ct
Alexandrite and diamond ring, 5.18ct Brazilian
Bonhams 2021
$95,000
$18,300/ct
Dealer's Notes
I walk away immediately if I'm not handed a GIA report. Synthetic alexandrite is everywhere, and it is visually indistinguishable from natural. The stakes are enormous: a natural stone might be $30,000/ct, while the synthetic duplicate is $100/ct. You cannot rely on a loupe; lab testing is essential.
The mistake collectors make is looking at alexandrite indoors. I take the stone outside at midday—never through window glass, which kills the UV—to see the true daylight green. Then I hit it with a pure incandescent bulb. The color change needs to be immediate, complete, and violent. If it's muddy, the value plummets.
Everyone obsesses over Russian origin, but I buy the stone, not just the paper. Yes, Russian commands a massive premium, but I've seen Brazilian material with such a ferocious color change that it trades at near-Russian prices. Color change strength drives the serious money.
Pre-1900 Victorian and Edwardian jewelry containing alexandrite is the holy grail. The Russian Ural mine was active then, and these stones were set directly into period mountings. You're getting untreated, guaranteed vintage Russian material in an original setting. I pay aggressively for these untouched pieces.
The ideal change leaves zero trace of the other color. I want vivid green in the sun, and vivid raspberry red under incandescent light. If I see a muddy brownish-green or a weak purple, I pass.
Frequently Asked Questions
Is alexandrite natural or always synthetic?
Both exist, and the market is flooded with synthetics. Natural alexandrite (a chrysoberyl variety) is one of the rarest geological flukes on earth, trading between $5,000 and $60,000+ per carat. Synthetic lab-grown alexandrite has a perfect color change and costs $50-$200/ct. Without a GIA report, assume it's synthetic.
What is the best color change for alexandrite?
Complete and dramatic. I look for a vibrant, pure green or blue-green in natural daylight, flipping instantly to a rich raspberry or purplish-red under incandescent light. No muddy transitions, no bleeding colors. A GIA or AGL report certifying 'strong color change' is what moves the needle on price.
Why is Russian alexandrite more valuable?
It's the original benchmark. Discovered in 1830 in the Ural Mountains, this deposit produced the most mind-bending, pure color change ever seen. The mine was effectively tapped out by 1900. When you buy Russian alexandrite, you are buying a finite antique artifact, not just a gemstone. It defines the ceiling of the market.
Can I find alexandrite in antique jewelry?
Yes, and when I find it, I buy it. Victorian and Edwardian pieces set with genuine alexandrite are historically crucial because they coincide with the active output of the Russian mines. But buyer beware: I see countless green stones in Victorian pieces heavily misidentified. Test everything.
From the Spectra Collection
Currently Available