Most months get one birthstone. October gets two: opal and tourmaline. That might sound confusing at first, but it actually gives October babies more choice than almost anyone else on the calendar. Opal brings a shifting rainbow trapped inside a single stone, while tourmaline shows up in nearly every color a gemstone can be. Together they cover so much visual ground that no other birthstone pairing comes close, and understanding why they were chosen says a lot about how birthstones as a whole came to be.
What Is the October Birthstone?
October’s birthstones are opal and tourmaline, and neither one outranks the other. Opal is the older, more traditional choice, tied to gem lists that go back centuries. Tourmaline is the newer addition, brought in during the 20th century mostly because opal can be delicate and some buyers wanted a tougher option in the same birth month.
Neither stone is considered “more correct” for an October birthday. Jewelers treat them as equal alternatives, so the choice usually comes down to color preference, budget, and how the stone needs to hold up to daily wear. Many October birthday pieces even combine both stones in the same design. A full breakdown of what each gemstone actually is, from formation to color varieties, is available in the separate guides to opal and tourmaline.
Why Does October Have Two Birthstones?
October has two birthstones because tourmaline was added later to give buyers a hardier alternative to opal. The story starts in 1912, when the American National Association of Jewelers met in Kansas City and put together the first official modern birthstone list for the United States. Opal was named October’s stone on that original list, largely because of its centuries-old reputation and its unmatched play-of-color.
Opal, though, is softer than most other gemstones used in jewelry, sitting around 5.5 to 6.5 on the Mohs hardness scale (a diamond, for comparison, is a 10). That softness makes it more prone to scratching and cracking than stones like sapphire or ruby. In 1952, the Jewelry Industry Council of America updated the birthstone list and added tourmaline to October, specifically pink tourmaline at first, as a tougher, more wearable option. Over time, the “pink” requirement faded, and any color of tourmaline came to count as an October birthstone.
October isn’t the only month with more than one option. June (alexandrite and pearl), August (peridot and spinel), and December (turquoise, tanzanite, and zircon) all work the same way, offering a traditional stone and a more modern or practical alternative.
Why Opal Is October’s Traditional Birthstone
Opal earned its spot as October’s original birthstone through centuries of reputation, long before any trade group made it official. The word itself comes from the Sanskrit “upala,” meaning precious stone, which became “opalus” in Latin. Roman regard for the gem ran deep enough that Pliny the Elder recorded a story of a senator who fled into exile rather than give up a prized opal to a political rival, an anecdote still repeated today as a measure of just how much value ancient Rome placed on the stone.
Its reputation wasn’t only about status. Ancient Greeks believed opal granted the power of prophecy and protection from illness, while some Middle Eastern traditions held that opals fell from the sky during lightning storms. Indigenous Australian traditions connect the stone to the Dreaming and the rainbow serpent, fitting since Australia still produces the vast majority of the world’s opal today. That long list of good-fortune beliefs is also why one persistent myth stands out.
Do Opals Bring Bad Luck?
No, the idea that opal brings bad luck is a myth with no real historical basis. It’s often traced to a 19th-century novel in which a character’s opal loses its color and misfortune follows, a piece of fiction some readers at the time mistook for fact. A related superstition claims opal only brings bad luck to someone wearing it outside their own birth month, so an October-born wearer supposedly has nothing to worry about either way. For most of history and in most cultures, opal was seen as a stone of good fortune, hope, and protection, not misfortune, a detail worth knowing for anyone gifting one for an October birthday.
Why Tourmaline Is October’s Modern Birthstone
Tourmaline was added to the birthstone list specifically to solve a practical problem: opal’s softness. Where opal sits at 5.5 to 6.5 on the Mohs hardness scale, tourmaline rates 7 to 7.5, making it noticeably tougher and better suited to jewelry that gets knocked around daily, like rings worn to work.
Tourmaline also brought something opal couldn’t: an even wider color range. Its name comes from the Sinhalese word “tōramalli,” meaning “mixed colored stones,” a reference to how early gem traders in Sri Lanka encountered crystals showing several colors at once. That range, from deep reds to neon blue-greens to soft pinks, meant October buyers who wanted a birthstone but weren’t drawn to opal’s look finally had a real alternative in the same birth month.
Opal vs. Tourmaline: Which to Choose?
Choosing between opal and tourmaline usually comes down to how the piece will be worn and what look is preferred. Someone drawn to a one-of-a-kind stone with unmatched visual movement will likely lean toward opal, since no other gem produces the same play-of-color effect. A birthstone piece meant to survive daily bumps, like an everyday ring, more often calls for tourmaline, thanks to its higher hardness.
Neither stone is objectively “better,” since they solve different problems. Opal offers rarity and drama at the cost of some fragility, and tends to suit earrings, pendants, and other pieces that see less daily friction. Tourmaline offers durability and a huge color range at a generally more approachable price point, aside from rare varieties like Paraíba, and handles ring settings more comfortably. Some October birthday jewelry pairs both stones in one piece, sidestepping the choice altogether.
Both stones benefit from the same basic care: a soft cloth and mild soapy water for cleaning, no ultrasonic or steam cleaners, separate storage away from harder gems, and no sudden temperature changes. Opal calls for more caution overall given its softness, while tourmaline tolerates daily wear more easily.
October Birthstone Meaning and Symbolism
Opal is generally associated with hope, creativity, and emotional change, largely because its shifting colors have always been read as a symbol of transformation. Tourmaline carries associations with balance, protection, and calm, partly tied to its wide color spectrum representing different moods depending on the shade.
October also spans two zodiac signs, Libra and Scorpio, and some jewelry traditions loosely pair each stone with one of the two. Opal’s shifting, harder-to-pin-down colors get associated with Libra, a sign known for weighing balance and beauty, while tourmaline’s bold range of colors and reputation for protection get tied to Scorpio’s more intense, guarded personality. These connections are cultural and symbolic rather than scientific, so they’re worth taking as fun context rather than fact.
Frequently Asked Questions
Is opal or tourmaline the “real” October birthstone?
Both are equally valid. Opal is the traditional birthstone with a longer history, while tourmaline is the modern birthstone added in 1952. Jewelers and gemological organizations recognize both as legitimate choices for October birthdays.
Why does October have two birthstones instead of one?
Tourmaline was added in 1952 as a more durable, wider-colored alternative to opal, not as a replacement. Opal remained on the list because of its historical significance and unmatched play-of-color, so the two now sit side by side rather than one replacing the other.
Which October birthstone is more durable for everyday wear?
Tourmaline, rated 7 to 7.5 on the Mohs hardness scale, holds up better to daily wear than opal, which sits at 5.5 to 6.5. That difference is the entire reason tourmaline was added to October’s birthstone list in the first place.
What color is October’s birthstone?
October doesn’t have one single color, since both opal and tourmaline occur across almost every color on the spectrum. Opal is often associated with its rainbow play-of-color, while tourmaline is closely tied to pink shades because pink tourmaline was the original color specified when it was added in 1952.
Are opal and tourmaline good for engagement rings?
Tourmaline works well for engagement rings thanks to its higher hardness, though it still benefits from a protective setting. Opal is more commonly used in engagement rings with protective bezel settings, or worn as earrings and pendants instead, since its softer structure makes it more vulnerable to the daily wear a ring experiences.
Conclusion
October’s two birthstones exist side by side for a clear reason: opal carries the older history and a visual effect no other gem replicates, while tourmaline was added specifically to give the same birth month a tougher, more colorful alternative. Knowing that history, and knowing which stone actually fits the piece being chosen, turns an October birthstone purchase into a much easier decision than picking one at random.
