Birthstones by Month, October: Opal and Tourmaline Meanings

Among the birthstones by month, October stands out because it is one of the few months that gives you a real choice: opal, with its shifting flashes of color, or tourmaline, a gem that comes in nearly every shade imaginable. One is an old favorite with a long and sometimes contradictory reputation; the other is a relative newcomer to the birthstone lists that has quickly become many people’s first pick. This guide walks through where both stones came from, what each looks like, what crystal traditions say about them, and how to choose and care for whichever one suits you.

Birthstones by month, October: why two stones?

Birthstone lists feel ancient, but the version most people know today is surprisingly modern. The idea of linking twelve gems to twelve months reaches back to early writers who connected the twelve stones of the high priest’s breastplate in the Book of Exodus with the months and the zodiac. Over centuries the habit grew from keeping a set of twelve stones and wearing one each month to wearing a single stone for your own birth month, a custom that only became common a few hundred years ago.

For October, older European lists paired opal with aquamarine. Then in 1912 the American National Association of Jewelers met in Kansas City to standardize birthstones, and their list named opal and tourmaline for October. In 1952 the Jewelry Industry Council of America revised the list and added pink tourmaline specifically. On the current U.S. chart of birthstones by month, October still has opal and tourmaline, while Britain’s own standardized list, first drawn up in 1937, keeps opal alone.

So the honest answer to “why two?” is that birthstone lists are cultural agreements, shaped by taste, trade and translation as much as by tradition. That is no reason to take them less seriously; it simply means you have room to choose. If you want the bigger picture, our chart of the birthstones by month and our look at birthstone history month by month trace how every month’s list has shifted.

Opal: the traditional October birthstone

What opal looks like

Opal is the stone most people picture when they think of October, and on every historical chart of birthstones by month, October is opal’s month first and foremost. Its signature is play of color: patches of red, green, blue, violet or orange that flicker and slide across the surface as the stone moves in the light. No two opals show the same pattern, which is a large part of their appeal. The background body color varies too. Some opals are milky white, some are dark grey to near black, which makes the flashes look especially vivid, and some are translucent orange or red. Plenty of opal shows no play of color at all and is simply soft and pearly, which some collectors call common opal.

Opal is relatively soft compared with many jewelry gems. If you would like the details, our article on opal on the Mohs hardness scale explains what its rating means. The Mohs scale, for anyone new to it, ranks minerals by how easily they scratch, from soft talc at 1 to diamond at 10. A softer stone picks up scratches from everyday dust and grit more readily, so opal rewards a little care.

Opal meaning in crystal traditions

In crystal traditions opal is often described as a stone of inspiration, imagination and emotional openness. Because its colors change with every angle, many people see it as a symbol of change, creativity and seeing life from new perspectives. It is believed to amplify whatever mood or intention the wearer brings, which is one reason some practitioners suggest wearing it when you are calm and clear about what you want.

Opal’s folklore is famously mixed. In some periods it was considered a lucky stone that combined the virtues of every gem whose color it showed; in others it picked up a reputation for bad luck, a superstition that still surfaces now and then. For October-born wearers, the usual view is that the stone is theirs by right, so the old worries do not apply.

How people use opal

• Jewelry: pendants and earrings are the gentlest settings for opal, since they rarely knock against hard surfaces.
• Meditation: some people hold a small opal and watch its colors shift as a focus for quiet, creative reflection.
• Placement: a polished opal on a desk or studio shelf is a popular reminder to stay curious and open.

Tourmaline: October’s colorful modern birthstone

What tourmaline looks like

Tourmaline is the opposite of a one-note stone. It comes in pink, red, green, blue, yellow, brown, black and colorless forms, and a single crystal can show two or more colors at once. Slices cut across some crystals show a pink center with a green rim, a pattern collectors nickname watermelon tourmaline. Raw tourmaline (uncut, as it came from the rock) often grows as long, striated crystals with grooves running along their length, while cut stones show off clear, saturated color.

Pink tourmaline is the shade most closely tied to October, thanks to its addition to the U.S. list in 1952. Still, any tourmaline counts as an October birthstone, so a green or blue stone is just as appropriate. Tourmaline is noticeably sturdier than opal for daily wear, which makes it a practical choice for rings and bracelets. If you are curious how gem crystals like this grow in the first place, our guide to how crystals are formed covers the main natural processes.

Tourmaline meaning in crystal traditions

Because tourmaline spans so many colors, crystal traditions tend to give each color its own emphasis:

• Pink tourmaline is associated with gentleness, compassion and self-kindness, and is often linked with the heart chakra (in yogic and crystal traditions, chakras are energy centers along the body).
• Green tourmaline is linked with growth, vitality and connection to nature.
• Blue tourmaline is associated with calm communication.
• Black tourmaline is one of the most popular grounding and protection stones in crystal practice, often kept near doorways.
• Watermelon tourmaline is seen as a stone of balance, since it holds two colors in one piece.

How people use tourmaline

People carry tumbled tourmaline (stones polished smooth in a rotating barrel) in a pocket, wear cut stones in everyday jewelry, place raw crystals on a windowsill or bedside table, or hold a piece during meditation as a grounding point. If you would like to see raw and tumbled pieces in person, Spirit Magicka, the journal’s own crystal shop, is one place to start browsing.

Opal or tourmaline: which is better for you?

Neither stone is better; they simply suit different people and different pieces of jewelry. Here is how they compare in practical terms.

A worked example

Imagine you are choosing a gift for a friend born on October 12th. She works with her hands, gardens on weekends and rarely takes her rings off. An opal ring would likely pick up scratches or knocks within months, so tourmaline is the practical choice for a ring. Since she loves the outdoors, a green tourmaline fits both her taste and its traditional association with growth. If she adores opal’s rainbow flashes, the compromise is an opal pendant she can wear on quieter days, paired with a tourmaline ring for everyday. When it comes to birthstones by month, October gives you the freedom to do exactly that.

Choosing for different people

Gift ideas often split along lines of “for a girl” or “for a boy”, but color and lifestyle matter more than any label. Deep green, blue, black or dark-bodied opal tend to suit people who prefer understated jewelry, while pink tourmaline and white opal feel softer and brighter. For children, a tumbled tourmaline kept in a keepsake box is a sturdier first birthstone than opal. Keep small stones away from very young children and pets, since tumbled stones are a choking hazard.

Late October birthdays, zodiac stones and day stones

Your month gives you opal and tourmaline no matter which day you were born. Specific dates such as October 23rd, 24th or 29th do not have separate stones or colors on the standard birthstone lists; they share the same two gems and the same palette of opal flashes and tourmaline hues. What changes across the month is your zodiac sign, and some people like to layer a zodiac stone on top of their birthstone.

In the tropical zodiac, Libra runs from 23 September to 22 October, and older zodiac lists give chrysolite as the Libra stone. Scorpio begins on 23 October and runs to 21 November, with beryl as its traditional stone. So someone born on October 23rd, right on the cusp, might wear an October birthstone alongside a beryl. Our article on zodiac birthstones by month lays out every sign and its stone.

There is one more layer for the curious: day-of-the-week stones, a separate older custom. Sunday is linked with topaz and diamond, Monday with pearl and crystal, Tuesday with ruby and emerald, Wednesday with amethyst and lodestone, Thursday with sapphire and carnelian, Friday with emerald and cat’s eye, and Saturday with turquoise and diamond. If you know the weekday you were born, that is another personal stone to add to your collection.

How to care for October birthstones

Of all the birthstones by month, October’s two need some of the most different care from each other, mainly because opal is softer and more sensitive.

Caring for opal

1. Clean gently. Wipe with a soft, slightly damp cloth and dry it straight away. Skip ultrasonic cleaners, steam and harsh chemicals.
2. Avoid soaking. Many opals are sold as doublets or triplets, thin slices of opal glued to a backing, and soaking can loosen the layers. Do not leave any opal sitting in water, and do not use it for crystal elixirs.
3. Protect it from heat and sudden temperature changes. Keep opal away from hot windowsills, radiators and direct sun for long periods, and take it off before saunas or hot baths.
4. Store it separately. Wrap opal in a soft pouch or a lined compartment so harder stones cannot scratch it.
5. Remove it for rough jobs. Gardening, gym sessions and household cleaning are the quickest ways to chip or scratch an opal.

Caring for tourmaline

1. Wash with warm soapy water and a soft brush, then rinse and dry.
2. Avoid sudden heat, which can stress the stone.
3. Store away from diamonds and sapphires, which are harder and can scratch it.

For energy cleansing in crystal practice, gentle dry methods suit both stones: resting them on a windowsill in moonlight, passing them through incense smoke in a ventilated room, or using sound from a bell or singing bowl. Many people find these small rituals a calming way to reset their stones at the turn of each month.

Where October sits among the birthstones by month

Seeing October in context helps explain its character. Several months, like June, August and December, now have two or three stones, often because newer gems were added alongside older ones. Here is the modern U.S. list, with links to our month-by-month guides where we have them.

• January: garnet. See January’s garnet.
• February: amethyst.
• March: aquamarine and bloodstone.
• April: diamond, with rock crystal on the UK list. See April’s diamond and rock crystal.
• May: emerald. See May’s emerald, agate and chrysoprase.
• June: pearl, moonstone and alexandrite. See June’s three stones.
• July: ruby. See July’s ruby, carnelian and onyx.
• August: peridot, spinel and sardonyx. See August’s three stones.
• September: sapphire. See September’s sapphire and lapis lazuli.
• October: opal and tourmaline.
• November: topaz and citrine.
• December: turquoise, zircon and tanzanite.

Looking down this list of birthstones by month, October’s colors are among the most varied on the calendar, since opal alone can show the whole spectrum. Our birthstone color chart lines up every month’s shades if you are planning a family piece with several stones. And if you would like to read about stones beyond the birthstone lists, the crystal library and the Earth treasures collection hold hundreds more.

Common mistakes with October birthstones

A few missteps come up again and again when people choose or wear these two stones.

• Putting a delicate opal in an everyday ring. It can be done with a protective bezel setting, but an open prong setting on a ring worn daily invites chips.
• Assuming only pink tourmaline counts. Pink has a special link to October, but in modern lists of birthstones by month, October is represented by tourmaline in all its colors.
• Treating every list as the official one. U.S., British and older traditional lists disagree, so aquamarine or opal alone are both defensible October answers depending on the tradition.
• Soaking opal for water cleansing. Dry cleansing methods are kinder, especially for doublets and triplets.
• Looking for a different stone for each date. Individual days do not have their own birthstones; if you want something date-specific, a zodiac or weekday stone is the traditional route.

We describe the meanings in this article as beliefs and traditions, not as proven effects. Our editorial approach explains how the journal handles crystal lore. However you see them, opal and tourmaline make October a generous month: one stone for people drawn to shifting light, another for people who want a sturdy jewel in their favorite color. If you are starting a collection, Spirit Magicka is the journal’s own shop for crystals and minerals.