What Is the September Birthstone? Sapphire Meaning, Color & Ring Guide

Sapphire is the birthstone for September. Blue is the color most closely associated with the month, but sapphire occurs in nearly every color except red, which is classified as ruby. Sapphire traditionally represents wisdom, loyalty, truth, and nobility, while its Mohs hardness of 9 makes it an excellent choice for rings intended for regular wear.

On the current U.S. industry list maintained by Jewelers of America, sapphire is the only September birthstone. Some British and international traditions also name lapis lazuli as an alternative. That does not make the answer uncertain. It means birthstone lists developed in different places before one modern list became dominant.

September Birthstone at a Glance

Hardness measures resistance to scratching. It does not mean that a gemstone or finished ring cannot chip, bend, or sustain damage from a hard impact.

Does September Have One, Two, or Three Birthstones?

For a clear modern answer, September has one primary birthstone: sapphire. The Jewelers of America birthstone list places sapphire—and only sapphire—under September. This is the standard most U.S. shoppers and jewelers mean when they refer to the September birthstone.

Why, then, do some sources give two answers? The National Association of Jewellers in the United Kingdom presents blue sapphire as the traditional September stone and lapis lazuli as an alternative. The International Colored Gemstone Association also lists “sapphire or lapis lazuli.” These are regional and historical variations, not a second universal official list.

Why Is Lapis Lazuli Sometimes a September Birthstone?

Birthstone traditions are older than modern gem identification. In ancient and medieval writing, gemstone names were not always used with today’s mineralogical precision. One explanation for the overlap is that lapis lazuli was sometimes called sapphire in older sources because both materials were prized for an intense celestial blue. The International Year of Crystallography educational archive notes this historical naming overlap.

The two materials are not gemologically the same. Sapphire is crystalline corundum and is transparent to opaque depending on the material. Lapis lazuli is an opaque rock composed of several minerals, often showing white calcite or gold-colored pyrite. Some British and international lists preserved lapis lazuli as an alternative, while the current U.S. list standardized September around sapphire.

Claims that September has three birthstones usually combine modern, historical, zodiac, or crystal traditions. There is no widely used current U.S. industry list that recognizes three equal September birthstones. If the question is simply “What is the September birthstone?” sapphire is the answer.

What Color Is the September Birthstone?

Blue is the signature September birthstone color. From midnight navy to vivid royal blue and softer cornflower tones, blue sapphire has become the visual shorthand for the month.

But sapphire is not a single-color gemstone. Sapphire and ruby are both varieties of corundum. Red corundum is called ruby; corundum in other colors can be called sapphire. Pink, yellow, green, white, purple, and orange sapphires are generally described as fancy-color sapphires. The GIA sapphire guide confirms that sapphire occurs in every color except red.

Does a pink or yellow sapphire still count as a September birthstone? Gemologically, yes: it is still sapphire. Culturally, blue remains the clearest choice if you want a ring that reads immediately as September. Molleln currently uses blue lab-grown sapphire in its sapphire rings.

What Does the September Birthstone Mean?

Sapphire has traditionally symbolized wisdom, loyalty, truth, sincerity, faithfulness, and nobility. The meanings are unusually well suited to a ring: they describe a promise that is thoughtful, direct, and intended to last.

Blue sapphire has appeared in royal and religious jewelry for centuries. Its color was associated with the sky and the heavens, while its use by rulers and clergy tied it to integrity and rank. The GIA September birthstone guide documents sapphire’s long associations with truth, faithfulness, and nobility.

Historical cultures also attributed protective or healing powers to sapphire. Those stories belong to folklore, not modern medical evidence. A sapphire ring can carry symbolism, memory, and intention; it should not be presented as a treatment or a guaranteed source of luck, wealth, or emotional change.

Is the September Birthstone Rare?

Sapphire is not uniformly rare. The word covers a broad gemstone family, and availability changes dramatically with origin, color, clarity, size, treatment, and whether the material is natural or laboratory-grown.

Exceptional natural sapphires can be genuinely rare. A large stone with vivid, evenly distributed color, attractive clarity, fine cutting, and little or no treatment may command a considerable premium. Geographic origin can add another layer of rarity and value when it is supported by an independent gemological report. An ordinary commercial sapphire and an exceptional untreated natural sapphire should not be discussed as if they were the same market.

Lab-grown sapphire is not geologically rare. Its value proposition is different: it offers sapphire’s color, hardness, and visual presence without the rarity premium associated with exceptional natural material. 

Is Sapphire Durable Enough for an Everyday Ring?

Yes. Sapphire ranks 9 on the Mohs scale, making it highly resistant to scratching and one of the strongest colored gemstone choices for a ring worn regularly. GIA also describes sapphire as tough and without cleavage, a combination that makes it suitable for engagement rings and other jewelry exposed to daily use.

That does not make a sapphire ring indestructible. A severe strike can still chip a stone, damage a prong, or bend a band. Pear, marquise, and princess cuts need particular attention at their points and corners. A halo, supportive prongs, a lower profile, or a frame around exposed edges can improve practical protection, but no setting removes the need for sensible care.

For daily wear, remove the ring before weight training, construction work, gardening, or any activity that puts the setting against hard surfaces. The sapphire may resist a scratch while the metal or stone-holding elements take the impact instead.

Natural vs. Lab-Grown Sapphire

Natural and lab-grown sapphire are both corundum. The difference is origin: one forms within the earth, while the other grows under controlled laboratory conditions. GIA explains that synthetic counterparts have essentially the same chemical, physical, and optical properties as their natural equivalents. “Lab-grown” therefore does not mean glass, cubic zirconia, or another material made merely to resemble sapphire.

There are several ways to grow sapphire in a laboratory. In simple terms, each method creates the controlled conditions needed for corundum crystal growth; gemologists can often distinguish the resulting growth features with specialized testing. 

Molleln’s sapphire rings use blue lab-grown sapphire. Each finished ring includes a Molleln ring certificate, but Molleln does not provide a separate independent gemological laboratory report for the sapphire center stone. The ring certificate should not be interpreted as a GIA or other third-party gemstone identification report.

How to Choose a September Birthstone Ring

Start With the Blue You Actually Want

“Blue sapphire” still leaves room for very different moods. A darker navy can feel formal and severe. Royal blue is saturated and commanding. A lighter cornflower direction feels softer and more open. Look at the stone in daylight, indirect window light, and ordinary indoor lighting. A blue that appears vivid under one spotlight may look much darker elsewhere.

Compare Millimeters, Not Only Carat Weight

Carat measures weight, not the apparent size of a stone on the hand. Shape, depth, and cutting proportions all influence face-up appearance. Compare length and width in millimeters, especially when choosing between oval and emerald cuts.

Let the Cut Decide the Attitude

• Oval: elongated, balanced, and easy to frame with a halo.
• Round: traditional symmetry with a clear central focus.
• Emerald cut: architectural lines and broader flashes rather than restless sparkle.
• Pear or marquise: directional and distinctive, with points that benefit from protective prongs.

Use the Setting to Shape the Presence

A halo expands the visual outline and introduces contrast around the blue center. Side stones create width without surrounding the entire sapphire. A simpler setting keeps the color unbroken. For someone with an active routine, consider how high the center stone sits and how exposed its edges are—not only how the ring looks from above.

Choose a Metal That Changes the Mood, Not the Stone

• White gold or platinum creates a cool, crisp frame around blue sapphire.
• Yellow gold adds warm contrast and a more classical character.
• Rose gold introduces a softer contrast with a romantic edge.

Molleln sapphire designs can be made in sterling silver, 10K, 14K, or 18K gold, and platinum, with yellow, white, or rose-colored metal options. Stone size, shape, setting details, and other design elements can also be discussed through Molleln Customization.

How to Care for a Sapphire Ring

Warm water, mild dish soap, and a soft brush are the safest routine starting point for a sapphire ring. Rinse carefully, dry with a soft lint-free cloth, and clean behind the center stone where lotion and residue tend to collect.

GIA notes that ultrasonic and steam cleaners are usually safe for untreated, heat-treated, and lattice-diffusion-treated natural sapphire, while fracture-filled or dyed material needs more cautious care. A finished ring may also include side stones, plating, adhesives, or other elements with different requirements, so warm soapy water remains the conservative at-home method when every treatment and component is not known.

• Store the ring separately so it does not scratch softer gemstones or metal surfaces.
• Remove it before heavy work, gym sessions, swimming, or using strong household chemicals.
• Have the prongs and setting checked after a hard impact or if the center stone begins to move.
• Do not rely on hardness alone; the setting is part of the ring’s durability.

Does the September Birthstone Change by Date or Zodiac Sign?

No. The month-based birthstone remains sapphire from September 1 through September 30. A person born on September 18 has the same September birthstone as someone born on September 2 or September 29.

The zodiac sign may change during the month, but that belongs to a different system. Most September birthdays through approximately September 22 fall under Virgo, while later dates generally fall under Libra; the exact transition can vary by year and time zone. A September Virgo still has sapphire as the month birthstone. Readers comparing month and zodiac traditions can continue with our Virgo Birthstone Guide.

September Birthstone FAQs

What are the two birthstones for September?

Sapphire is the primary September birthstone and the only September stone on the current U.S. Jewelers of America list. Some British and international traditions also recognize lapis lazuli as an alternative.

Does September have three birthstones?

Not on the current U.S. industry list, which assigns sapphire to September. Lists claiming three or more usually combine stones from different regional, historical, zodiac, or crystal traditions rather than one modern standard.

Is the September birthstone rare?

Sapphire as a broad gemstone category is not uniformly rare. Exceptional natural sapphires can be rare depending on color, clarity, size, origin, and treatment status. Lab-grown sapphire is not geologically rare and is generally more accessible.

What is the birthstone for a September Virgo?

Sapphire is the month birthstone for a Virgo born in September. Zodiac gemstone traditions may associate Virgo with additional stones, but they do not replace September’s month-based sapphire.

What is the birthstone for September 18?

The September 18 birthstone is sapphire. The exact day does not change the monthly birthstone. September 18 is also generally a Virgo birthday, which is a separate astrological classification.

Can sapphire be lab-grown?

Yes. Lab-grown sapphire is corundum grown under controlled conditions and has essentially the same chemical, physical, and optical properties as natural sapphire. It is different from a simulant that only imitates sapphire’s appearance.

Are all September sapphires blue?

No. Blue is the traditional color most associated with September, but sapphires can be pink, yellow, green, white, purple, orange, and other colors. Red corundum is classified as ruby.

Is sapphire suitable for everyday rings?

Yes. Sapphire’s Mohs hardness of 9 and good toughness make it one of the strongest colored gemstone choices for everyday rings. The stone and setting should still be protected from severe impacts.

How should you clean a sapphire ring?

Use warm water, mild soap, and a soft brush or lint-free cloth for routine cleaning. If the ring’s treatments or other components are unknown, avoid harsh chemicals and ask the jeweler before using steam or an ultrasonic cleaner.

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A Blue That Does Not Need Permission

September does not need a crowded answer. Sapphire has carried the month for generations: blue enough to be recognized at once, hard enough to live beyond the occasion, and steady enough to turn loyalty into something visible.

A lab-grown sapphire does not borrow the geological rarity of a natural stone. It makes a different case—color under control, enduring hardness, and more freedom to choose the scale and setting that feel right.

Explore the Molleln Sapphire Rings Collection, compare more months in our Birthstone Rings Collection, or use Molleln Customization to change the shape, size, metal, or setting around your blue.

For the complete calendar, read Birthstone Rings by Month: Meaning, Gemstones & Ring Ideas.

Ruby holds fire. Peridot holds summer light. Sapphire holds the September sky—and it does not let go.