Sapphire — The September Birthstone
Sapphire — The September Birthstone
How a 1912 retail-jewellers' standardisation made sapphire the gift of choice for September birthdays
Sapphire is the traditional and modern birthstone for September, holding that position in the standardised birthstone list since the National Association of Jewelers (later AGTA's predecessor) adopted the list at its Kansas City convention in 1912. Earlier folkloric and astrological birthstone traditions also assigned sapphire to September, giving the modern designation deeper roots than the simple retail-trade origin sometimes implies. Sapphire's combination of durability, colour range, and cultural symbolism has made it one of the most successful birthstone choices, suitable for daily-wear jewellery and frequently chosen for engagement rings, anniversary pieces, and fine gifts.
Origins of the September association
Birthstone lists as we now understand them — twelve gems, one per month — coalesced in the late nineteenth and early twentieth centuries from a mixture of biblical, astrological, and folkloric traditions. The biblical sources — the breastplate of Aaron in Exodus 28 and the foundation stones of the New Jerusalem in Revelation 21 — provided sets of twelve precious stones that medieval and early modern writers connected to the months and zodiacal signs in various, often contradictory, ways. Sapphire's connection to autumn months, including September, recurs across these traditions, sometimes alongside or competing with chrysolite, zircon, and other autumn-coded stones.
The 1912 standardisation by what became the American Gem Society and AGTA fixed sapphire as the September birthstone for the modern Western retail trade. The list has been revised periodically — alternative birthstones have been added for several months — but September has remained sapphire-anchored across all subsequent revisions. The British equivalent, established by the National Association of Goldsmiths, also recognises sapphire for September, with broad alignment between the American and British lists.
What counts as a sapphire birthstone
Modern usage accepts blue sapphire as the default September stone, but fancy-colour sapphires — pink, yellow, green, purple, padparadscha, and colour-change — are equally appropriate within the same gem species. Corundum is the species; sapphire is the variety name applied to gem-quality corundum in any colour other than red, which is named ruby. A pink-sapphire or yellow-sapphire piece is no less a sapphire birthstone than a blue one, and the trade has increasingly promoted fancy-colour sapphire as a way to broaden the gift category beyond the dominant blue.
Star sapphire — sapphire with the asterism phenomenon — is also acceptable as the September birthstone and offers a distinctive alternative for gifts and bespoke commissions. The choice between transparent faceted sapphire and translucent star sapphire is a matter of personal preference and design context rather than birthstone authenticity.
Practical advantages
Sapphire's hardness — 9 on the Mohs scale, second only to diamond — makes it suitable for any jewellery format, including the rings and bracelets that take the most daily wear. Sapphire jewellery given as a September birthday gift can be worn continuously with reasonable care; ultrasonic and steam cleaning are generally safe for unheated and conventionally heated stones. The wide commercial availability of sapphire across price points — from accessible heated commercial stones to museum-quality unheated origin material — makes it a workable choice at every gift budget.
In the trade
For September birthday and birthstone gifts, the practical recommendation is to choose colour first and then optimise for the budget. A well-cut, eye-clean two-carat heated Ceylon sapphire in a flattering colour delivers more long-term satisfaction than a larger but greyish or windowed stone of the same outlay. For significant birthdays — eighteenth, twenty-first, fortieth, fiftieth — a laboratory report adds confidence and resale value should the piece be passed on or sold later. Fancy-colour sapphire offers a way to differentiate the gift from the dominant blue category and is particularly suited to recipients who already own blue jewellery.