September birthstone
Sapphire
Sapphire belongs to the corundum family, the same mineral family as ruby, and its cool blue tone has made it a symbol of truth and faithfulness for centuries. Medieval clergy wore sapphire rings to represent heaven, while European royals favored it as a sign of wisdom and good judgment. It has always felt less like a stone for show and more one for steady, quiet meaning.
Beyond its ties to loyalty, sapphire is associated with clarity of thought and calm under pressure, qualities that made it a favorite among scholars, diplomats, and anyone who needed a level head. It's also linked to honesty in relationships, which is part of why it became a popular alternative for engagement rings, most famously the sapphire chosen for Princess Diana's, later Kate Middleton's, ring.
Sapphire is best known for velvety blue, ranging from pale sky tones to deep midnight, colored by trace amounts of iron and titanium. Blue has long been associated with trust, depth, and calm, which is likely why sapphire became linked with loyalty and clear thinking. Sapphires also occur in pink, yellow, green, and white, though blue remains the classic September choice.
Sapphire suits people who value steadiness over flash, those who appreciate a stone with quiet depth rather than loud sparkle. It ties naturally to the two September zodiac signs, Virgo and Libra, both associated with clear thinking and balance, qualities sapphire has symbolized for centuries. It also makes a fitting gift for anyone marking a meaningful commitment or milestone.
Ancient Persians believed the sky was reflected from a giant sapphire, and clergy in medieval Europe wore it as a symbol of heaven and purity. Russian czars and British royals prized sapphire for centuries, and it remains tied to the British crown jewels today. Across cultures, it has consistently represented wisdom, protection, and faithful devotion, more than mere decoration.
Sapphire ranks 9 on the Mohs hardness scale, making it one of the toughest gemstones and well suited to everyday rings. Clean it with warm water, mild soap, and a soft brush, then dry with a lint free cloth. Avoid harsh chemicals and ultrasonic cleaners if the stone has been treated. Store separately from softer jewelry to prevent scratching.
Birthstones by month
Curious what else your month says about you? Read your zodiac sign or explore color meanings.
Frequently asked questions
›What is the September birthstone?
The September birthstone is sapphire, a variety of the mineral corundum best known for its deep blue color. It's the sole traditional birthstone for the month and has been prized for thousands of years for both its beauty and its long standing symbolism of wisdom, loyalty, and calm.
›What color is sapphire, and does it only come in blue?
Blue is the most recognized color, but sapphire actually comes in nearly every hue, including pink, yellow, green, and white, sometimes called 'fancy sapphires.' Only red corundum is classified separately, as ruby. Blue remains the traditional color associated with the September birthstone.
›What does sapphire symbolize?
Sapphire has long been associated with wisdom, loyalty, and inner peace. Historically, it was linked to protection and honesty, worn by clergy and royalty as a symbol of good judgment and faithful devotion, meanings that still carry into how the stone is gifted and worn today.
›Is sapphire a durable stone for everyday jewelry?
Yes. Sapphire rates 9 on the Mohs hardness scale, second only to diamond, making it highly resistant to scratches. This durability is one reason it's a popular choice for engagement rings and other jewelry meant to be worn daily for years.