What is the september birthstone?

September’s birthstone is Sapphire.

Modern vs traditional birthstones?

Some months have both a traditional stone and a modern alternative (for example, December). Both are listed when our dataset includes them.

Check hardness and density against the table below, read any gem-lab report, or scan the piece in the Jewelry Identifier app.

* Birthstones

The traditional and modern birthstone for september is Sapphire. Below: Mohs hardness, specific gravity, and links to each gem’s full reference.

Published July 11, 2026

Gem	Mohs	SG	Family
Sapphire	9–9	3.97–4.05	corundum

* Frequently asked

Q. What is the september birthstone?: A. September’s birthstone is Sapphire.
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.

* Try it

Just take a photo — AI reads the metal, gemstone, hallmark, era, and an estimated value range in seconds. First two scans free, no account required.

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