Amber
Amber isn’t a mineral at all. That classification gap matters more here than it does for most stones on this site. It’s fossilized tree resin — organic material that oozed from ancient conifers and other resin-producing trees.
It then hardened and slowly polymerized over millions of years underground into the amorphous, glassy material sold as a gem today. Because it never formed through crystallization, it has no crystal system, and because it’s a variable organic polymer rather than a defined compound, it has no single chemical formula either. Both fields are genuinely null, rather than facts this page is missing.
Pearl is the only other organic material cataloged on this site. However, pearl forms through a living organism’s secretions rather than resin fossilization. As a result, the two arrive at “organic” by very different routes.
That organic origin also explains amber’s most practical property: it’s soft. At Mohs 2 to 2.5, it’s among the softest materials regularly worn as a gem. It’s soft enough that a fingernail (itself close to Mohs 2.5) can leave a mark on it.
As a result, this rules out cutting facets that need to survive daily wear the way a harder stone’s would. It also means amber jewelry needs real care around abrasion, heat, and solvents — it can even be damaged by some perfumes and cleaning products. Its refractive index is correspondingly low and narrow, at 1.54 to 1.55.
Amber’s color runs through yellow, orange, and brown tones. Some pieces also preserve trapped insects or plant fragments from the moment the resin was still fluid. That feature has made certain specimens scientifically valuable as well as decorative.
The Baltic region — Russia, Lithuania, and Poland — is the best-known source of amber in general use, including material dated to around 44 million years old. The Dominican Republic, meanwhile, produces amber especially prized for the clarity of its inclusions. Myanmar (Burma) produces some of the oldest commercially significant amber, roughly 99 million years old.
Amber doesn’t appear on any of the historical or modern monthly birthstone lists, or on either zodiac system tracked on this site. It’s included here as a standalone reference entry.
Gemmological properties
| Mohs hardness | 2–2.5 |
|---|---|
| Crystal system | Not recorded |
| Chemical formula | Not recorded |
| Refractive index | 1.54–1.55 |
| Color family | Yellow, Orange, Brown |
| Variety of | — |
| Also known as | — |
| Origins | Russia, Dominican Republic, Lithuania, Poland, Myanmar |
| Organic material | Yes |
Amber is fossilized tree resin, not a mineral — organic, amorphous, and among the softest materials ever used as a gem at Mohs 2-2.5, soft enough to scratch with a fingernail. It has no crystal system and no fixed formula, being a complex organic polymer. Pearl is the only other organic material cataloged on this site.
Frequently asked questions
- Is amber a mineral?
- No. Amber is fossilized tree resin, an organic material formed over millions of years as resin hardens and polymerizes underground, rather than a mineral formed through crystallization. It has no crystal system and no fixed chemical formula, being a complex organic polymer instead.
- How soft is amber compared to other gemstones?
- Very soft — Mohs 2 to 2.5, among the softest materials regularly used as a gem. That's soft enough to be scratched with a fingernail (fingernail is roughly Mohs 2.5), which is far below quartz at Mohs 7 or corundum (ruby and sapphire) at Mohs 9.
- Is amber a birthstone on any of the lists this site tracks?
- No. It doesn't appear on any of the historical, US, UK, or zodiac systems documented on this site — it's covered here as a standalone gemstone reference entry.