Extraterrestrial Gemstone Database

Born from Impact

14.7 million years ago, a meteorite struck Earth and created something unprecedented — a gemstone forged by cosmic violence, found in only one place on the planet, irreplaceable forever.

14.7M
Years Old
24 km
Crater Diameter
~275 t
Total Supply Ever
1
ET Gemstone Known
Sister Site · Now Live

Thinking of buying Moldavite?
Know what it's really worth.

MoldaviteGems.com is our free, independent buyer's guide to Czech Moldavite. Real 2026 prices per gram drawn from dealer listings and actual sales, plain-English grading, and the tests that expose fake green glass before you spend a dollar.

Explore MoldaviteGems.com

Free · No sign-up · Updated October 2026

Explore Moldavite

The complete story of Earth's most improbable gemstone — from cosmic origin to modern rarity.

☄️

The Impact

A 1km asteroid struck Bavaria at 72,000 km/h. The explosion launched molten glass into the stratosphere. It rained across Bohemia as moldavite.

Read more →
🗺️

Geographic Origin

Found only in a 20,000 km² strewn field across the Czech Republic. Besednice, Chlum, and Slavče are the legendary sites.

Read more →
📉

Rarity & Value

~275 tonnes created, ever. Surface deposits nearly exhausted. Cannot be synthesized. When it's gone, it's gone forever.

Read more →
🔬

The ET Gemstone

The only gemstone whose formation required an extraterrestrial event. Its composition has no terrestrial equivalent.

Read more →
🏛️

History & Culture

From Paleolithic talismans to medieval Grail legends to 21st century collectors — 25,000 years of human fascination.

Read more →
🔍

Real vs. Fake

Counterfeit moldavite floods the market. Learn to identify genuine specimens through texture, bubbles, and lab verification.

Read more →

There will never be more moldavite

Unlike diamonds, gold, or any other precious material — moldavite cannot be mined elsewhere, grown in a lab, or synthesized. The total supply was fixed by one asteroid, 14.7 million years ago.

Explore Rarity Data →

Quick Reference

Property Detail
TypeTektite (natural impact glass)
CompositionSiO₂ ~80% + Al₂O₃, FeO, MgO, CaO, K₂O
ColorForest green to olive green
Hardness5.5–7 Mohs
TransparencyTranslucent to transparent
Age14.7 ± 0.2 million years (Ar-Ar dating)
Origin EventNördlinger Ries meteorite impact, Bavaria
Found InCzech Republic (Bohemia & Moravia)
Total Supply~275 tonnes (fixed, non-renewable)
StatusOnly known extraterrestrial gemstone