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.
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