* Birthstones
October birthstones
The traditional and modern birthstones for october are Tourmaline, Opal. Below: Mohs hardness, specific gravity, and links to each gem’s full reference.
Published July 11, 2026
October stones
| Gem | Mohs | SG | Family |
|---|---|---|---|
| Tourmaline | 7–7.5 | 3–3.26 | tourmaline |
| Opal | 5.5–6.5 | 1.98–2.25 | opal |
* Frequently asked
FAQ
- Q. What is the october birthstone?
- A. October’s birthstones are Tourmaline, Opal.
- Q. Modern vs traditional birthstones?
- A. Some months have both a traditional stone and a modern alternative (for example, December). Both are listed when our dataset includes them.
- Q. How do I identify my birthstone jewelry?
- A. Check hardness and density against the table below, read any gem-lab report, or scan the piece in the Jewelry Identifier app.
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