October Birthstone: Opal and Tourmaline Explained

October Birthstone: Everything You Need to Know About Opal and Tourmaline

October is one of the few months with two official birthstones, and they couldn't be more different from each other. June is another month that shares this distinction, and if you're curious how its stones compare, the June birthstone guide covers Pearl, Moonstone, and Alexandrite in the same depth.

Opal is the traditional October birthstone, known for its shifting rainbow colors. Tourmaline is the modern addition, available in nearly every color imaginable. Both are recognized by the American Gem Society and the Gemological Institute of America.

If you were born in October, you have more choices than almost any other birth month. That's either exciting or confusing depending on how you look at it.

This guide covers both stones, what they mean, what colors they come in, and how to choose the right one for jewelry.

What Is the Birthstone for October?

October has two birthstones: Opal and Tourmaline.

Opal is the older of the two and the one most people associate with October. Tourmaline was added to the modern birthstone list in 1952 to give consumers more affordable and durable options.

Both are fully recognized as October birthstones. Neither is more "official" than the other.

October Birthstone: Opal

What Is Opal?

Opal is a mineraloid, not technically a crystal, formed from silica spheres that diffract light to produce color. That shifting, rainbow-like play of color is called opalescence or play-of-color, and no two opals look exactly alike.

Australia produces over 90 percent of the world's precious opal. Ethiopian opal has also grown significantly in popularity over the last decade, known for its bright, vivid play-of-color.

October Birthstone Color: Opal

This is where opal gets interesting. Opal doesn't have one color. It has all of them.

The base color of an opal can be white, black, gray, orange, or crystal clear. The play-of-color that flashes across the surface can show red, green, blue, purple, yellow, and orange, sometimes all in the same stone.

Types of opal by color:

• White opal — light body tone with pastel play-of-color. Most common variety.
• Black opal — dark body tone with vivid, high-contrast play-of-color. Most valuable.
• Boulder opal — brown ironstone matrix with veins of opal. Strong, natural-looking.
• Fire opal — orange to red body color, often from Mexico. May or may not show play-of-color.
• Crystal opal — transparent or semi-transparent body, bright play-of-color.

Black opal from Lightning Ridge, Australia is the rarest and most expensive variety, with top-quality stones fetching more per carat than diamonds.

October Birthstone Meaning: Opal

Opal has carried symbolic meaning across cultures for centuries.

Ancient Romans called it opalus and considered it the most precious of all gemstones because it contained the colors of every other stone.

In Arabic tradition, opal was believed to have fallen from the sky during lightning storms, carrying celestial fire inside it.

The primary meanings associated with opal as the October birthstone:

• Creativity and inspiration — the shifting colors are linked to imagination and artistic expression
• Hope and purity — particularly white opal, which has long been associated with innocence
• Amplification — some traditions hold that opal intensifies emotions and intentions, both positive and negative
• Transformation — the stone's constantly changing appearance is tied to change and adaptability

The old superstition that opal brings bad luck to anyone not born in October is largely a 19th-century fiction, popularized by a Sir Walter Scott novel in 1829 rather than any genuine gemstone tradition.

October Birthstone: Tourmaline

What Is Tourmaline?

Tourmaline is a boron silicate mineral that occurs in more color varieties than any other gemstone. A single tourmaline crystal can show multiple colors in zones, which is where the term "watermelon tourmaline" comes from, pink in the center, green on the outside.

Brazil, Nigeria, and Afghanistan are the primary sources of gem-quality tourmaline. Paraíba tourmaline from Brazil, with its electric neon blue-green color, is among the most valuable gemstones in the world.

October Birthstone Color: Tourmaline

Unlike opal, tourmaline has a specific color most closely associated with October: pink and reddish-pink tourmaline, also called rubellite.

That said, tourmaline occurs naturally in:

• Pink and hot pink (most popular for October birthstone jewelry)
• Green (including the electric Paraíba variety)
• Blue and indicolite
• Watermelon (pink core, green rim)
• Black (schorl, the most common but least used in jewelry)
• Yellow and orange
• Colorless (achroite, rare)
• Color-change varieties

For October birthstone jewelry specifically, pink tourmaline is what most designers and buyers default to, both for its visual appeal and its symbolic alignment with the warmth of autumn.

October Birthstone Meaning: Tourmaline

Tourmaline's meanings vary somewhat by color, but the general associations for the October birthstone are:

• Compassion and healing — pink tourmaline in particular is linked to emotional healing and self-love
• Protection — black tourmaline has one of the strongest protection associations in gemstone tradition
• Creativity — shared with opal, tourmaline is linked to artistic thinking and communication
• Balance — the stone's ability to carry multiple colors in one crystal is tied symbolically to harmony between opposites

Meaning of October Birthstone Colors

Both October birthstones carry color-specific meanings worth understanding if you're choosing a stone based on what it represents rather than just how it looks.

If you're buying October birthstone jewelry as a gift, matching the color to something meaningful about the recipient goes a long way. Pink tourmaline for someone who values emotional connection. Black opal for someone who gravitates toward striking, unusual pieces.

Which October Birthstone Should You Choose?

This depends on three things: what you value visually, how you plan to wear it, and your budget.

Choose Opal if: You want a genuinely unique stone, something no one else has the same version of. Every opal looks different. The shifting colors photograph beautifully and draw attention in ways most stones don't. Opal is best in pendants and earrings rather than rings, since it's softer (5.5-6.5 on the Mohs scale) and can scratch with daily wear.

Choose Tourmaline if: You want something more durable for everyday wear. Tourmaline sits at 7-7.5 on the Mohs scale, harder and more resistant to scratching. Pink tourmaline in particular is versatile, works in rings, necklaces, and earrings, and the range of shades from soft blush to deep magenta means there's a version that flatters most settings and skin tones.

Budget consideration: Good quality tourmaline tends to be more affordable than fine opal of comparable visual appeal. A beautiful pink tourmaline ring costs significantly less than a high-quality opal with strong play-of-color at the same carat weight. For anyone buying October birthstone jewelry at a mid-range budget, tourmaline typically delivers more visual impact per rupee or dollar spent.

October Birthstone Jewelry

October Birthstone Ring

Tourmaline is the better choice for a ring worn daily. Its hardness handles the everyday contact that damages softer stones over time.

If opal is specifically wanted for a ring, a bezel setting (where metal wraps around the entire edge of the stone) protects it significantly better than a prong setting that leaves the stone exposed.

Doublet and triplet opals, where a thin slice of opal is backed with dark material and topped with a protective cap, are more durable and affordable than solid opals and work reasonably well in rings.

October Birthstone Necklace

Opal shines in pendant form. A solitaire opal pendant allows the play-of-color to catch light from multiple angles as it moves, which is exactly what makes opal visually exciting. Free-form opal pendants cut to follow the natural shape of the stone are popular and tend to show more color than calibrated cuts.

Pink tourmaline necklaces work well in both simple solitaire settings and layered multi-stone designs. The color holds its appeal at smaller carat weights better than most stones, making tourmaline pendants affordable even at fine jewelry quality.

October Birthstone for Girls

For younger wearers, pink tourmaline in sterling silver is the most practical choice. It's durable enough for active wear, the color appeals broadly across age groups, and silver settings keep the cost accessible.

Opal jewelry for young girls works best in stud earrings rather than rings or bracelets where the softer stone takes more impact. Lab-created opal, which has the same optical properties as natural opal but at a fraction of the cost, is worth considering for children's jewelry specifically.

Caring for October Birthstones

Opal care: Opal contains water, typically three to twenty percent of its weight, which makes it sensitive to extreme temperature changes, very dry environments, and ultrasonic cleaners. Clean with a soft damp cloth only. Store separately from harder stones that can scratch it. Avoid leaving opal in direct sunlight for extended periods.

Tourmaline care: Significantly lower maintenance. Warm soapy water and a soft brush works well. Avoid ultrasonic cleaners for included stones. Tourmaline is generally safe for most standard jewelry cleaning methods.

The Bottom Line

October's two birthstones cover almost every visual preference and budget range between them.

Opal is unrepeatable. If you want a stone that's genuinely one of a kind and you're willing to care for it accordingly, nothing else looks like it.

Tourmaline is versatile and durable. Pink tourmaline specifically has become one of the most popular birthstone choices across all months, not just October, because of how well it wears and how broadly it appeals. If you're comparing stones across birth months, September's sapphire sits at 9 on the Mohs scale, making it one of the hardest birthstones available. The September birthstone guide covers its meaning, colors, and history in full.

Both are October birthstones. Both are worth wearing. The choice between them is really a question of whether you're drawn to something otherworldly and precious, or something you can put on every morning without thinking twice about it.

Frequently Asked Questions

What is the birthstone for October? 

October has two birthstones: Opal and Tourmaline. Opal is the traditional stone, Tourmaline is the modern addition recognized since 1952.

What color is the October birthstone? 

Opal displays a shifting rainbow of colors rather than a single hue. Tourmaline comes in nearly every color, though pink is the variety most associated with October birthstone jewelry.

What is the meaning of the October birthstone? 

Opal is associated with creativity, hope, and transformation. Tourmaline, particularly pink tourmaline, is linked to compassion, emotional healing, and balance.

Is opal or tourmaline better for October birthstone jewelry? 

For rings worn daily, tourmaline. For pendants and earrings, opal is stunning and the softer hardness matters less. Budget-wise, tourmaline delivers more at mid-range price points.

What does pink tourmaline mean as an October birthstone? 

Pink tourmaline is specifically associated with love, compassion, and emotional healing. It's one of the most commonly chosen stones for October birthstone gifts for women.

Is black opal the most valuable October birthstone?

Yes. Black opal from Lightning Ridge, Australia is among the most valuable gemstones in the world. Top-grade black opal can exceed diamond prices per carat.

Can men wear October birthstone jewelry? 

Yes. Black tourmaline and dark opal both work in men's jewelry. Simple tourmaline rings or leather cord pendants with a single stone are popular formats for men's birthstone pieces.