September birthstone
September birthstone
Sapphire, the modern American and international assignment
Sapphire is the birthstone for September on the modern American birthstone list established by the (then) National Association of Jewellers in 1912 and curated thereafter by Jewelers of America. The September-sapphire assignment is consistent across the principal modern reference lists — the American National Retail Jewelers Association (ANRJA) original 1912 list, the GIA reference, the AGTA Birthstone Reference, and the Jewelers of America current list — and is therefore one of the more stable assignments across both American and international jewellery retail. Blue sapphire is the traditional default for the month, though fancy-colour sapphires (pink, yellow, padparadscha, white, green) are accepted as September birthstones at the discretion of the wearer and the retailer.
The 1912 list and subsequent updates
The 1912 birthstone list was a commercial initiative by the American jewellery retailers' trade association to standardise the assignments — which previously had varied considerably across regions and retailers — and to provide a consistent merchandising framework for monthly birthstone jewellery. Sapphire was assigned to September with little controversy; the stone had been associated with the month in earlier polymath and gemological traditions and was an obvious choice given its commercial availability, durability, and well-established gemmological identity. Subsequent updates to the list — additions of tanzanite to December, citrine alongside topaz to November, and so on — have left the September-sapphire assignment unchanged.
Sapphire as the September stone
Corundum, the mineral species of sapphire and ruby, is one of the harder gem species at Mohs hardness 9, second only to diamond among common gem minerals. The combination of hardness, durability, well-established cutting tradition, broad colour range, and ample commercial supply makes sapphire a workable birthstone option at the full price spectrum from inexpensive heated Thai blue sapphire to exceptional unheated Kashmir, Burmese, or Sri Lankan material at five and six figures per carat. Pricing is driven principally by colour saturation, origin (where applicable), heat-treatment status, and clarity, with origin and treatment status the two most material variables for fine stones.
Padparadscha sapphire — the pinkish-orange or orange-pink variety historically associated with Sri Lanka and now also produced from Madagascar and Tanzania — is the most coveted of the fancy-colour sapphires for September birthstone jewellery, commanding premiums comparable to or exceeding fine blue sapphire of equivalent quality. Pink sapphire and yellow sapphire serve the lower end of the fancy-colour September market.
Symbolic associations
Sapphire's symbolic associations — wisdom, loyalty, royalty — derive from a long historical tradition rather than from any modern gemmological or birthstone source. The stone's use in royal and ecclesiastical jewellery (Princess Diana's engagement ring, the British Imperial State Crown's sapphires, the Black Prince's Ruby in the same crown which is in fact a spinel) has reinforced the royal-and-loyal symbolic register in popular usage. For September birthstone marketing, these associations are the principal narrative hooks employed in retail and editorial contexts.
In the trade
For retail buyers approaching September birthstone jewellery, the practical decisions are colour, treatment, and origin disclosure. Routine commercial blue sapphire is heat-treated and disclosed as such; the price step from heated to unheated sapphire of comparable colour is material and worth understanding before purchase. Origin disclosure on stones above approximately three carats is increasingly the norm at the top of the market, with reports from Gübelin, SSEF, AGL, GIA, and Lotus Gemology serving as the standard supporting documentation. For under-three-carat commercial stones, treatment disclosure is essential but origin reporting is generally not commissioned.