Sapphire is one of the most recognized and revered gemstones in the world. It is one of only four precious gemstones (alongside diamond, emerald, and ruby), it has adorned royalty for thousands of years, and it is the second hardest natural gemstone on Earth. Most people think of sapphire as blue, but it actually comes in nearly every color of the rainbow. If you were born in September, if you're a Virgo or Libra, or if you simply love the idea of a gemstone that kings, queens, and scholars have treasured for millennia, this guide covers everything worth knowing about sapphire.
What Is Sapphire?
Sapphire is a variety of the mineral corundum, an aluminum oxide (Al2O3) with a Mohs hardness of 9. It is the same mineral that produces ruby. The only difference between the two is color: red corundum is classified as ruby, and all other colors of corundum are classified as sapphire. They share the same hardness, crystal structure, and physical properties.
Blue sapphire, the most famous variety, gets its color from trace amounts of iron and titanium within the corundum crystal. The most prized blue is a vivid, saturated "cornflower" or "royal" blue. But sapphire's color range extends far beyond blue, and understanding that range is one of the most interesting things about this gemstone.
Sapphire Colors: Far More Than Blue
One of the biggest surprises for most buyers is that sapphire comes in virtually every color. These non-blue varieties are known as "fancy sapphires," and each gets its color from different trace elements:
Blue sapphire is the classic, caused by iron and titanium. Shades range from light cornflower to deep royal blue to inky midnight. The most valued blues are vivid and saturated without being so dark they appear black.
Pink sapphire contains chromium, the same element that colors ruby red. The line between "dark pink sapphire" and "light red ruby" is debated among gemologists, and different labs sometimes classify the same stone differently. Pink sapphire has become increasingly popular for engagement rings and everyday jewelry.
Yellow sapphire gets its color from iron. Shades range from pale lemon to rich golden. Yellow sapphire is prized in Vedic astrology as a stone of prosperity and wisdom.
Green sapphire contains a combination of iron and titanium in different proportions than blue. It ranges from pale mint to deep forest green and is often more affordable than blue sapphire of similar quality.
Padparadscha sapphire is one of the rarest and most valuable varieties, showing a delicate mix of pink and orange. The name comes from the Sinhalese word for lotus blossom. Fine padparadscha sapphires from Sri Lanka can command prices comparable to the finest blue sapphires.
White (colorless) sapphire contains no color-causing trace elements. It has sometimes been used as a diamond alternative, though it lacks diamond's fire and brilliance.
Star sapphire contains needle-like inclusions of rutile ("silk") that create a six-rayed star effect when the stone is cut as a cabochon. The "Star of India," at 563 carats, is one of the most famous gemstones in the world and resides at the American Museum of Natural History in New York.
Sapphire and Ruby: The Same Mineral
This fact surprises most people: sapphire and ruby are the exact same mineral. Both are corundum. Both score a 9 on the Mohs hardness scale. Both form under similar geological conditions. The only difference is which trace element is present and what color it produces.
Chromium produces red, and red corundum is ruby. Iron and titanium produce blue, and blue corundum is sapphire. All other colors of corundum, whether pink, yellow, green, orange, purple, or colorless, are also classified as sapphire. This means that a pink sapphire and a ruby are essentially the same stone separated only by a color boundary that gemologists sometimes disagree about.
This shared identity means sapphire and ruby have identical care requirements, identical durability, and identical crystal structures. If you already own ruby jewelry, you know exactly how sapphire will perform. To learn more about ruby's history and properties, read our complete ruby guide.
A Brief History of Sapphire
Sapphire has been treasured by civilizations across the world for thousands of years, consistently associated with wisdom, royalty, and divine favor.
Ancient Greeks wore sapphire when consulting the Oracle at Delphi, believing the stone would help them receive and understand divine wisdom. The word sapphire comes from the Greek sappheiros and Latin sapphirus, both meaning blue stone, though some scholars believe these ancient terms may have originally referred to lapis lazuli.
In medieval Europe, sapphire was the gemstone of the clergy and the court. Kings and bishops believed it protected against harm, promoted honest judgment, and symbolized heaven. Sapphire was often set in ecclesiastical rings, and Pope Innocent III decreed in the 13th century that bishops' rings should contain sapphire set in pure gold.
In ancient Persia, people believed that the Earth rested on a giant sapphire and that its reflection gave the sky its blue color. Hindu traditions associated sapphire with Saturn and considered it a powerful stone for discipline, focus, and spiritual growth.
Sri Lanka has been one of the world's richest sapphire sources for over 2,000 years. The island was known to ancient traders as "Ratna Dweepa," meaning Gem Island. Kashmir sapphires, discovered in the Himalayas in the 1880s, are among the most valuable gemstones ever found. Their distinctive velvety blue, caused by microscopic inclusions that scatter light, commands extraordinary prices at auction.
Perhaps the most famous sapphire in modern history is the 12-carat oval blue sapphire that was set in Princess Diana's engagement ring in 1981 and later given by Prince William to Catherine Middleton. That single ring did more to popularize sapphire engagement rings than any marketing campaign ever could.
Sapphire Meaning and Symbolism
Sapphire symbolizes wisdom, truth, loyalty, nobility, and mental clarity. Throughout history it was known as the "wisdom stone" and was sought by scholars, judges, spiritual leaders, and anyone who valued clear thinking and honest communication.
In crystal healing traditions, sapphire is connected to two chakras: the Throat Chakra (5th Chakra), which governs communication and self-expression, and the Third Eye Chakra (6th Chakra), which governs intuition, insight, and inner vision. This dual connection makes sapphire a popular stone for those seeking to communicate their truth with clarity and to deepen their understanding of themselves and the world around them.
Sapphire is also strongly associated with loyalty and fidelity, which is one reason it has been a popular engagement ring stone for centuries, long before Princess Diana brought it into the modern spotlight.
Sapphire: The September Birthstone
Sapphire is the birthstone for September and has held that designation since the 1912 birthstone list (though it was historically associated with April before that standardization). Sapphire is also the traditional gemstone gift for the 5th, 45th, and 70th wedding anniversaries, giving it one of the longest anniversary associations of any gemstone.
As a September birthstone, sapphire is associated with the zodiac signs Virgo (August 23 through September 22) and Libra (September 23 through October 22). For Virgo, sapphire is thought to enhance analytical thinking, precision, and attention to detail. For Libra, it is said to promote balance, harmony, and clear decision-making.
For buyers who love September's deep blue but want a more accessible price point, London blue topaz (Mohs 8) offers a sophisticated teal-navy alternative. Learn more in our London blue topaz comparison guide.
Explore our September birthstone collection or browse birthstone gifts for every month.
Sapphire vs. London Blue Topaz for September
This is one of the most common comparisons September birthday shoppers make, and both stones are excellent choices with different strengths.
Sapphire is corundum (Mohs 9), one of four precious gemstones, and carries centuries of association with royalty and wisdom. It is harder, rarer, and more expensive than London blue topaz. Blue sapphire ranges from cornflower to royal blue, typically with cooler blue undertones.
London blue topaz is topaz (Mohs 8), a durable and beautiful gemstone that offers a deep teal-navy color at a much more accessible price. Its color is warmer than most sapphires, with green undertones that give it a distinctive modern feel.
Both are durable enough for everyday jewelry. The choice comes down to budget, color preference, and whether the prestige of a precious gemstone matters to you or the recipient. At Erin Gallagher Jewelry, we carry both, and our September collection features pieces in each stone.
Are Most Sapphires Treated?
Yes. The majority of sapphires on the market are heat-treated to improve their color and clarity. Heat treatment has been used on sapphires for centuries and is considered the industry standard. The treatment is permanent, stable, and does not degrade over time. Heat-treated sapphires are genuine sapphires, not synthetic or imitation stones.
Untreated sapphires of fine quality do exist but are rare and command premium prices. The most valued untreated sapphires come from Kashmir (where mining largely ceased in the early 20th century), Myanmar, and Sri Lanka.
Some sapphires undergo other treatments, including lattice diffusion (adding elements at high temperature to change color) and fracture filling. These treatments are less common and should always be disclosed. At Erin Gallagher Jewelry, we are transparent about all gemstone treatments.
How to Care for Sapphire Jewelry
Sapphire is one of the easiest gemstones to care for, thanks to its exceptional Mohs 9 hardness.
Cleaning: Warm soapy water (mild dish soap) and a soft brush is the safest and most effective method. Gently scrub, paying attention to the back of the setting. Rinse thoroughly and pat dry with a soft lint-free cloth. Ultrasonic cleaners are generally safe for standard heat-treated sapphires but should be avoided for fracture-filled stones.
Daily wear: Sapphire handles daily wear in all jewelry types, including rings, better than almost any other colored gemstone. It resists scratching from quartz dust, sand, and everyday materials. Remove before heavy manual work to protect the metal setting.
Storage: Store separately from diamonds (Mohs 10), which are the only common gemstone hard enough to scratch sapphire. Sapphire can scratch softer stones like opal, peridot, topaz, and garnet, so keep them in separate compartments.
What to avoid: Harsh chemicals (bleach, chlorine, ammonia) and extreme heat changes for treated stones. For standard heat-treated sapphires, normal temperature exposure is fine.
Where Sapphire Is Found
The most significant sources of sapphire include Sri Lanka (the oldest continuous source, producing sapphires for over 2,000 years in a wide range of colors), Kashmir in the Himalayas (legendary source of velvety blue sapphires, largely mined out), Myanmar (producing rich royal blue), Madagascar (a major modern source with excellent quality), Thailand (historically important for cutting and heat treatment expertise), and Montana in the United States (producing unique pastel and color-change sapphires from the Yogo Gulch and Missouri River deposits).
Australia, Tanzania, Vietnam, and Cambodia are also significant producers. Each source produces sapphires with characteristic color profiles and inclusion patterns.
Shop Sapphire Jewelry
Every sapphire piece at Erin Gallagher Jewelry is handcrafted in Colorado using 14K gold, gold-fill, or recycled sterling silver. Browse sapphire necklaces, earrings, bracelets, rings, and charms from $20, or design your own custom piece through GemBar. Every piece ships gift-ready in our eco-friendly packaging with gift bag, tissue, cleaning cloth, and card. Orders over $150 ship free.
Explore our full sapphire collection and learn more →
Frequently Asked Questions
Is sapphire the birthstone for September?
Yes. Sapphire is the September birthstone and has held that designation since the 1912 list. It is one of four precious gemstones and the traditional gift for 5th, 45th, and 70th wedding anniversaries.
Are sapphire and ruby the same stone?
Yes, they are the same mineral: corundum (Mohs 9). Red corundum is classified as ruby. All other colors are classified as sapphire. They share identical hardness, crystal structure, and physical properties.
Do sapphires only come in blue?
No. Sapphires occur in pink, yellow, green, orange, purple, white, black, and the rare padparadscha (pink-orange). These are called "fancy sapphires." The only color corundum does not produce as sapphire is red, which is classified as ruby.
Are most sapphires heat-treated?
Yes. Heat treatment is the industry standard for sapphire and has been used for centuries. The treatment is permanent and stable. Untreated sapphires of fine quality are rarer and command premium prices.
Can you wear sapphire every day?
Yes. Sapphire scores a 9 on the Mohs hardness scale, second only to diamond. It resists scratching better than nearly every other colored gemstone and is ideal for daily wear in all jewelry types, including rings.
What does sapphire symbolize?
Sapphire symbolizes wisdom, truth, loyalty, nobility, and mental clarity. It was historically called the "wisdom stone" and was worn by royalty, judges, and clergy. It is connected to the Throat Chakra (communication) and Third Eye Chakra (intuition) and associated with Virgo and Libra.
For stone-specific buying guides and care instructions, visit our Birthstone Guides resource.