Two birthstones. One month. You could assume it's a mix-up, or some compromise nobody took the time to sort out. It's neither.

Opal came first, and by "first" we mean centuries before anyone thought to write an official birthstone list down at all. Its whole reputation rests on play-of-color: that shifting, restless flash that moves as the stone moves, so no two glances at the same opal look quite the same.

Tourmaline is the newer name on the list, added in 1952, and it's earned its place in a completely different way, not by shifting, but by multiplying. Pink, green, blue, sometimes three of those colors banded into a single crystal like a tiny geological argument nobody won.

We think that contrast is exactly why October birthstone jewelry is so much fun to shop for. A Boulder Opal Conch Pendant and an Elongated Tourmaline Argyle Ring don't look like they belong to the same month, and yet here we are, both unmistakably October, and both heirlooms worth passing down. If you were born this month, you get to pick your personality: the one-of-a-kind flash of opal, or the deep, saturated confidence of tourmaline. There's no wrong answer.

What is the October birthstone?

Opal has been October's stone for so long that pinning down an exact start date is somewhat impossible. Writers in ancient Rome were already raving about it. By the time birthstone traditions solidified into anything resembling an official system, opal was locked into October (no committee required).

As the modern add-on, Tourmaline didn't join until 1952, when the Jewelry Industry Council of America updated the list and gave October a second, sturdier option.

Opal is the one-of-a-kind pick. No two stones ever show the same pattern, so it's the sentimental choice, the one that feels hand-picked before anyone's even touched it. Tourmaline is the wear-it-everywhere pick, with a color range wide enough that nobody can really dislike it. Rather than force people to choose, October kept both.

October birthstone meaning & symbolism

Opal's meaning tends to circle the same three words no matter which culture you're reading about: hope, creativity, innocence.

Ancient Greeks thought it granted the gift of foresight. Some crystal traditions go a step further and treat opal less like a source of feeling and more like a lens that amplifies whatever emotion is already there, rather than creating a new one. In the more spiritual corners of gemstone lore, opal gets tied to something bigger too: cosmic consciousness, expanded intuition, that kind of language.

Tourmaline's symbolism sits lower to the ground, in a good way. Compassion. Reassurance. Protection. Historically, people carried tourmaline tucked into a pocket as a protective talisman, which says something about how seriously the stone used to be taken. Pink tourmaline narrows all of that into something more intimate: love, emotional openness, self-care in the modern sense of the phrase. It's the variety people reach for when the gift is really about tenderness (a partner, a milestone, or just deciding you deserve something nice this year).

None of this has aged out of relevance, either. People still buy opal to mark a creative leap. They still buy pink tourmaline to mark falling in love, or choosing themselves. Some things about a stone just don't change.

What color is the October birthstone?

There's no single October birthstone color. Opal's signature move is play-of-color, where it displays pretty much every color of the rainbow. Hold one up to a lamp and tilt it slowly. Watch what happens. That flicker (flash opal, some people call it) is the entire reason the stone has had a devoted following for two thousand years running.

Tourmaline skips the single-signature-color approach entirely and just does all of them: pink, green, blue, yellow… Sometimes several at once in the same crystal. Pink is the one most associated with October birthstone jewelry specifically: warm, a little cool-toned, unmistakably rose. Watermelon tourmaline, banded green on the outside with a pink core, is the most visually distinct multicolor variety, and it costs more for that reason.

For both stones, the rule holds: the more saturated and even the color, the higher the value.

The history of October birthstones

Ancient Romans called opal the "queen of gems". One first-century writer (Pliny the Elder) described a single opal as holding the fire of ruby, the violet of amethyst, and the sea-green of emerald, all at once. One senator, Nonius, reportedly chose exile over giving up his opal to Mark Antony.

That said, the stone hasn't always had good press.

The unlucky-opal idea is barely two hundred years old. It traces to one specific source: Sir Walter Scott's 1829 novel Anne of Geierstein, in which an enchanted opal loses its color right before its owner dies. The novel was a huge hit, and European opal sales reportedly dropped by half within a year of it hitting shelves. But Queen Victoria, unbothered, wore opal publicly and gave it to her own daughters specifically to push back on the superstition. It worked. Eventually.

The history of tourmaline reads more like a case of mistaken identity. A Spanish conquistador found green tourmaline crystals in 1500s Brazil and assumed he'd struck emerald; nobody corrected the record until the 1800s, when mineralogists finally recognized tourmaline as its own species.

China's Empress Dowager Cixi loved pink tourmaline enough that Californian mines shipped roughly 120 tons of it to her court between 1902 and 1910. That's not a typo. One hundred and twenty tons, for one woman's taste in jewelry.

October birthstone facts

Opal sits at 5.5 to 6.5 on the Mohs hardness scale, while tourmaline sits at 7 to 7.5, solidly in daily-wear territory alongside quartz and most other gems people wear without thinking twice.

Geography matters too. Australia produces roughly 95% of the world's opal, with smaller amounts out of Mexico, Brazil, Ethiopia, and a handful of U.S. states. Sourcing for tourmaline is far less concentrated: Brazil, Afghanistan, Nigeria, and Madagascar all produce meaningful quantities, and each region's stones carry a slightly different color signature depending on the trace minerals in that particular ground.

But let's explain the "magic". Opal forms when silica-rich water seeps into cracks in sedimentary rock and hardens, slowly, into tiny silica spheres stacked in careful rows. When those spheres line up close enough in size, they bend light into the spectral flashes we call play-of-color. When they don't line up (which is most of the time), you get common opal instead: no flash, no fire, just a plain stone doing none of the interesting stuff. Because the spacing of those spheres is essentially random on a microscopic level, no two opals are ever exactly alike.

October birthstone jewelry ideas

An October birthstone necklace is the easiest entry point if you're buying for someone and you're not entirely sure what they'd pick for themselves. Something like our Birthstone Charms Necklace lets the stone do the talking without committing to a specific cut or setting. For rings, the Elongated Tourmaline Argyle Ring and Large Starry Tourmaline Ring both lean into tourmaline's durability. The Boulder Opal Conch Pendant, on the other hand, is really about showing off what makes opal worth the extra fuss in the first place.

If you're a stacker, October's stones layer well with almost anything you already own. A single Starry Birthstone Ring next to a plain gold band is a pairing that simply works, and October's palette (the pinks, the fire, the greens) tends to sit well against most other birthstone colors if you're slowly building a family stack, one month at a time.

Explore more pieces in our dedicated October Birthstone Jewelry collection.

How to care for October birthstone jewelry

Opal is the needy one. Skip the ultrasonic cleaner completely, keep it away from sudden temperature swings, and don't let it sit in water any longer than it takes to rinse off. A soft, barely damp cloth handles most of what your opal actually needs. Set it down gently when you take it off (don't just throw it in a bowl with everything else) and store it away from harder stones so nothing scratches it while it's sitting in a drawer.

By comparison, tourmaline is much lower-maintenance. Warm soapy water and a soft-bristled brush get the job done, and its 7 to 7.5 hardness is part of why so many people choose tourmaline as the piece they never take off, rather than something saved for special occasions.

Heat is worth avoiding on both stones regardless, and neither one should go near chlorine, harsh chemicals, or a hot shower. If you only remember one rule, make it this: treat opal like an occasional-wear piece, and tourmaline like a daily one.

October birthstone frequently asked questions

What is the October birthstone?

Two, technically. Opal is the traditional pick, tourmaline the modern one (added in 1952). Opal is known for its play-of-color; tourmaline for a color range wide enough to include almost anything, with pink being the shade most tied to the month.

Why does October have two birthstones?

Because nobody wanted to force a choice. Opal was already October's stone by the time the modern birthstone list was standardized in 1912. Tourmaline joined forty years later, in 1952, giving October babies a sturdier, more affordable second option.

What does opal symbolize?

Hope, creativity, and innocence, mostly. Ancient Greeks linked it to prophecy, and some traditions describe it as intensifying whatever emotion a wearer already has.

What color is the October birthstone?

Whatever color you want, really. Opal shifts across a pale or dark base thanks to play-of-color, and tourmaline covers nearly the entire spectrum, but pink is the one most people associate with October specifically.

Is opal bad luck?

No, and it's a fairly recent myth at that. The superstition traces to a single 1829 novel, not to any real history or gemology. Before that book, opal was considered one of the luckiest stones you could own.

Can opal be worn every day?

Opal is softer than diamond or tourmaline, so daily wear means staying mindful about water, heat, and the occasional bump.

What zodiac signs are associated with October birthstones?

Opal traditionally pairs with Libra (September 23 - October 22). Tourmaline gets linked to both Libra and Scorpio (October 23 - November 21), which tracks, since October splits between the two signs anyway.