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Opal, tourmaline, and diamond stud earringsOpal, tourmaline, and diamond stud earrings

What Is October's Birthstone?

October has two official birthstones: opal and tourmaline. Opal is the traditional October birthstone, and tourmaline was recently added as an alternative option.

Updated: August 31, 2026

Expertise you can trust: Brilliant Earth is known for its award-winning jewelry designs and seamless, innovative shopping experience. This Brilliant Earth gemstone guide covers the October birthstones, opal and tourmaline, and details their history, meaning, color, and more. All Brilliant Earth guides are meticulously researched and reviewed by our certified gemologists, content, editorial, and brand teams before publication to ensure industry-leading excellence and accuracy.

October Birthstones

The official October birthstones are opal and tourmaline. Each of the two birthstones showcases extraordinary color, making them among the most visually captivating birthstone options. Opal is recognized as the traditional birthstone for October, while tourmaline was added later, giving those born in October more than one vibrant gemstone to choose from.

October Birthstone

Description

History

Meaning & Symbolism

Color

Hardness

Care

Opal

Traditional October birthstone; a hydrated silica gemstone known for its play-of-color.

Cherished since ancient times; the Romans believed it brought good luck, and in the Middle Ages it was seen as a symbol of purity and hope.

Creativity, inspiration, and hope; thought to enhance imagination and self-expression.

Play-of-color showing white, black, blue, green, and red; black opals are the rarest and most valuable.

5.5–6.5 Mohs; relatively soft and best suited in protected settings.

Clean with a soft, damp cloth. Avoid harsh chemicals and ultrasonic cleaners, and store in a cool, moist environment.

Tourmaline

Newer October birthstone; prized for its wide spectrum of colors.

Not identified as a distinct mineral until the 19th century; green tourmalines found in Brazil in the 1500s were first mistaken for emeralds.

Balance, protection, and compassion; thought to foster self-confidence and reduce fear.

Nearly every hue; also occurs in bi-color and tri-color stones.

7–7.5 Mohs; and suitable for everyday wear with care.

Clean with warm, soapy water and a soft brush. Avoid high heat, sudden temperature changes, and harsh chemicals.

Opal Birthstone

Opal is the traditional October birthstone. It is a hydrated silica gemstone celebrated for its mesmerizing play-of-color, a phenomenon that produces shifting flashes of rainbow hues within a single stone. Because no two opals look exactly alike, each one is truly one of a kind.

History of the Opal Birthstone

Opals have been cherished since ancient times, with early civilizations attributing magical properties to them. The Romans admired opals and believed they brought good luck. During the Middle Ages, opals were considered a symbol of purity and hope. The lore surrounding opals is rich and varied, and it has contributed to the gemstone's enduring allure as the traditional birthstone for October.

Opal Birthstone Meaning & Symbolism

For those born in October, opal symbolizes creativity, inspiration, and hope. The gemstone is thought to enhance imagination and creativity, and it has historically been considered a stone of luck and inspiration. Its shifting colors are often seen to represent possibility, optimism, and individuality.

Opal Birthstone Color

Opals are renowned for their captivating play-of-color, which can exhibit every color of the rainbow. This phenomenon, known as opalescence, occurs due to the diffraction of light within the silica spheres of the stone. Common colors seen in opals include white, black, blue, green, and red, with black opals being the rarest and most valuable.

Opal Birthstone Hardness

Opals are relatively soft, ranking 5.5 to 6.5 on the Mohs hardness scale. This makes them more susceptible to scratches than harder gemstones. Opals also have a high water content and can crack if they dry out or are exposed to sudden temperature changes.

Because of their delicate nature, opals are best suited for occasional wear in protected settings, such as pendants and earrings, rather than everyday rings that might experience frequent impacts.

Opal Birthstone Care

Opals require special care due to their delicate nature. Clean opal jewelry with a soft, damp cloth, and avoid harsh chemicals and ultrasonic cleaners.

Store opals in a cool, moist environment, such as a fabric pouch with a damp cotton ball, to help prevent them from drying out over time.

Opal and Diamond Ring

Tourmaline Birthstone

Tourmaline is the newer October birthstone. It is prized for its incredible color variety, appearing in nearly every hue and sometimes showcasing multiple colors within a single stone. This diversity has made tourmaline a favorite for those seeking a colorful, individual gemstone.

History of the Tourmaline Birthstone

Tourmaline was not identified as a distinct mineral until the 19th century. Before that, many colorful tourmalines were often mistaken for other gemstones. In the 1500s, Spanish conquistadors in Brazil discovered green tourmalines, which they initially thought were emeralds. The name "tourmaline" comes from the Sinhalese word "toramalli," meaning mixed gems, a reference to the gemstone's diverse color range.

Tourmaline Birthstone Meaning & Symbolism

Tourmaline is said to promote balance and protection. It is thought to calm the mind, foster self-confidence, and reduce fear. Different colors of tourmaline are believed to carry specific properties, with pink tourmaline associated with love and compassion, and green tourmaline linked to courage and strength. More broadly, tourmaline is connected to compassion, self-confidence, openness, and acceptance.

Tourmaline Birthstone Color

Tourmaline is prized for its incredible color variety. It can be found in almost every hue, from pastel pinks and blues to vibrant greens and reds. Some tourmalines even exhibit multiple colors in a single stone, often referred to as bi-color or tri-color tourmalines, with watermelon tourmaline being a popular example as it showcases both pink and green hues.

Tourmaline Birthstone Hardness

Tourmalines rank 7 to 7.5 on the Mohs hardness scale. This makes them more durable than opals and well suited for everyday wear. However, they can still be damaged by hard knocks and should be treated with care.

Tourmaline Birthstone Care

Tourmaline jewelry can be cleaned with warm, soapy water and a soft brush. Avoid exposure to high heat or sudden temperature changes, as tourmalines can fracture under extreme conditions.

It is also advisable to keep tourmaline jewelry away from harsh chemicals to help preserve its color and brilliance over time.

Green Tourmaline Pendant Necklace

October Birthstone FAQ

What color is the October birthstone?

October's two birthstones are both known for their color. Opal is famous for its play-of-color, displaying shifting flashes of white, black, blue, green, and red within a single stone. Tourmaline, by contrast, can be found in almost every hue, from pastel pinks and blues to vibrant greens and reds, and some stones even show multiple colors at once.

Is opal a birthstone?

Yes, opal is one of the two birthstones for October. It is recognized as the original and traditional October birthstone.

How many birthstones does October have?

October has two birthstones, opal and tourmaline. Opal is the traditional birthstone, while tourmaline was added later as an alternative.

Why does October have two birthstones?

October has two birthstones because birthstone traditions have evolved over time to reflect changing availability, new additions, and consumer preferences. This allows those celebrating their birthday in October to have a variety of options.

Is tourmaline a birthstone?

Yes, tourmaline is one of October's two birthstones. It was added as an alternative to opal and is especially valued for its wide range of colors.

What does the October birthstone look like?

October's two birthstones look distinctly different from one another. Opal displays a mesmerizing play-of-color, with shifting flashes of white, black, blue, green, and red that make each stone unique. Tourmaline appears in nearly every color, from pastel pinks and blues to vibrant greens and reds, and can even show multiple colors in a single stone, as in watermelon tourmaline.

Is the October birthstone opal or tourmaline?

Both. October has two official birthstones: opal, the traditional choice, and tourmaline, which was added later as an alternative.

What does the October birthstone mean?

October's two birthstones each carry their own meaning. Opal symbolizes creativity, inspiration, and hope, and is thought to enhance imagination. Tourmaline represents balance, protection, and compassion, and is believed to foster self-confidence and reduce fear.

What is the original birthstone for October?

Opal is the original, traditional birthstone for October. While tourmaline is now recognized as an alternative October birthstone, opal remains the classic and historically significant choice for the month.

Why did the October birthstone change?

October's birthstone did not so much change as expand. Opal has long been the traditional October birthstone, and tourmaline was later added as an alternative option. This gives those celebrating an October birthday more than one gemstone to choose from, with opal remaining the classic choice.