Sapphire

The September birthstone: Sapphire

September's birthstone is the sapphire, and the colour the name conjures is a deep, velvety royal blue — the blue of a clear sky just after sunset, or of deep water. It's the gem of the month when summer's heat gives way to autumn's clarity, and its colour carries the same cool, settled quality. A fine sapphire's blue is one of the most coveted colours in all of gems.

For most of history sapphire was the stone of heaven, wisdom, and divine favour. Medieval clergy wore it to symbolise the blue of the heavens and to keep their thoughts pure and elevated; kings wore it as a protection against envy and harm, and believed it would not shine for the impure. It became the gem of truth, sincerity, and faithfulness — which is why, centuries later, it remains a classic engagement stone, a promise of constancy in a colour that doesn't fade.

Sapphire is corundum, the same mineral as ruby, coloured blue by traces of iron and titanium instead of red by chromium. While we picture it blue, sapphire actually comes in nearly every colour except red (a red corundum is simply a ruby) — pink, yellow, green, and the rare, prized pinkish-orange padparadscha. The legendary blues came from Kashmir and Burma; Sri Lanka, Madagascar, and Montana are major modern sources.

September birthstones: modern, traditional & mystical

Different traditions assign September different stones. The modern list — set by the American jewellery trade in 1912 and the one most charts use today — sits alongside the older traditional list and the centuries-old Tibetan “mystical” list.

Meaning & symbolism

Sapphire was the stone of heaven, wisdom, and divine favour for most of its history. Medieval clergy wore it for the blue of the heavens and to keep their thoughts pure; kings wore it against envy and harm, and believed it would not shine for the impure. From that grew its lasting meaning — truth, sincerity, and faithfulness — which is why, centuries on, it remains a classic engagement stone: a promise of constancy in a colour that doesn't fade.

Properties & benefits believed

Sapphire is a stone of wisdom, truth, and serenity. It's said to calm and focus the mind, to sharpen insight and discernment, and to guard against deceit and envy. Long the gem of faithfulness and noble purpose, it carries associations with loyalty, integrity, spiritual clarity, and a love or commitment that holds true.

These are traditional and folkloric associations — the meanings cultures have attached to sapphire over centuries, not medical claims. Worn as a birthstone, it's above all a way of carrying your month with you.

Color & origin

Sapphire is prized for its royal blue colour. The most legendary sapphires came from Kashmir and Burma; today fine stones come from Sri Lanka, Madagascar, Thailand, and Montana.

Who Sapphire suits

Sapphire suits the wise and the principled — clear-thinking people with a strong inner compass. Born in clarifying September, they tend toward discernment, integrity, and a quiet authority. If you're the one others trust to tell the truth and keep their word, this is your stone.

The zodiac signs of September

September spans two zodiac signs, depending on where in the month you were born. Read your sign to see how its story lines up with your stone.