October is one of the lucky months. While most months carry a single birthstone, October claims two: opal and tourmaline. One shimmers with a shifting rainbow trapped inside the stone; the other comes in more colors than almost any other gem on earth. Together they give October babies an unusually rich range to choose from, whether you’re drawn to quiet, grounding darkness or playful, dancing light.
In this guide we cover both stones in full: what they are, what they mean, the energy and chakras they work with, how to recognize quality, how to tell real from imitation, and how to actually wear them day to day. If you want to see how October fits alongside the rest of the calendar, our guide to birthstones by month lays out the full year.
What Is October’s Birthstone?
October’s two official birthstones are opal and tourmaline. Opal is the older, more traditional choice, prized for its play-of-color — that flickering display of spectral hues that seems to move as you tilt it. Tourmaline was added later as a modern alternative, partly because it offers such an enormous spread of colors that there’s a shade — and an energy — for nearly everyone.
Because the two stones look nothing alike, October birthstone jewelry can lean in very different directions. Opal feels ethereal and luminous, a stone of inspiration and imagination. Tourmaline can feel bold and saturated — or, in the case of black tourmaline, calm, dark, and deeply grounding. Many people simply pick the one that matches their personality and the energy they want to invite in.
The Meaning and Symbolism
Opal is the stone of imagination, creativity, and hope. Because it holds every color at once, it has long been treated as a master stone of inspiration — a symbol of all the gemstones combined. It’s said to amplify emotions, spark creativity, and open the higher chakras, encouraging you to dream bigger and stay receptive to possibility. Opal carries a luminous, almost magical energy that draws the eye and lifts the spirit.
Tourmaline’s energy shifts with its color. Pink tourmaline (rubellite) opens the heart chakra and radiates compassion, self-love, and tenderness. Green tourmaline carries the energy of growth, renewal, and abundance. Black tourmaline, the variety we feature most, is one of the most powerful protective stones in the crystal world: it grounds you to the earth through the root chakra, shields against negativity and draining energy, and anchors you when life feels scattered. Keep it close as your personal energetic bodyguard — a stone that absorbs the noise so you can stay steady, clear, and rooted.
A Short History
Opal’s name likely traces to the Sanskrit upala and the Greek opallios, both pointing to the idea of a precious stone. Ancient Romans ranked it among the most valuable gems, admiring the way it seemed to contain the fire of a ruby and the green of an emerald at once — and they wore it as a talisman of hope and good fortune. For a brief period in the 1800s opal carried an unlucky reputation, thanks largely to a popular novel — a superstition that has long since faded, leaving opal’s true reputation as a stone of luck and inspiration intact.
Tourmaline has a more tangled history because, for centuries, its many colors caused it to be confused with other gems. Stones we now know to be tourmaline were once sold as rubies and emeralds. Its name comes from the Sinhalese turmali, a term once used for mixed, unidentified colored gems — a fitting origin for a stone that refuses to settle on one color, or one kind of energy.
What It Looks Like
Opal’s signature is play-of-color: patches and flashes of spectral hues that drift across the surface as the stone moves. The body color underneath can be milky white, soft gray, deep black, or even transparent. The most dramatic opals show vivid color against a dark background.
Tourmaline, by contrast, is defined by sheer variety. It appears in pink, red, green, blue, yellow, brown, and black, and sometimes shows two or more colors in a single crystal. Black tourmaline is opaque and inky, often with fine vertical striations running along the crystal — a clean, architectural kind of beauty rather than a sparkling one, and a look that matches its no-nonsense protective energy.
Quality: What to Look For
For opal, the play-of-color matters most. Look for bright, vivid flashes, a broad range of colors, and a pattern that covers most of the stone rather than appearing in one small patch. Body tone affects value too — black opals command the highest prices, while white and crystal opals are more accessible.
For tourmaline, judge color first: rich, even saturation is most desirable. Many colored tourmalines are prized for clarity and clean facets. Black tourmaline is opaque by nature, so here you look instead for a deep, even color and a smooth, well-finished surface. With both stones, ask whether any treatment has been applied and expect that disclosed.
Where It Comes From
Australia has historically been the world’s primary source of fine opal, especially the famous black opal from Lightning Ridge and white opal from Coober Pedy. Ethiopia and Mexico are also important sources, with Mexico known for its warm fire opals.
Tourmaline is mined far more widely. Brazil is a major source, including the rare and vivid Paraíba tourmaline. Significant deposits also occur in Africa — Nigeria, Mozambique, and Madagascar — as well as Afghanistan, Pakistan, and parts of the United States such as California and Maine.
Color and Type Varieties
Opal varieties are usually named by body tone and origin: black opal, white opal, crystal (transparent) opal, boulder opal (still attached to its host rock), and fire opal (warm orange-to-red, often without strong play-of-color, and carrying a vibrant, energizing warmth).
Tourmaline has its own named family. Rubellite is the pink-to-red heart-chakra variety, indicolite the blue stone of calm and intuition, verdelite the green stone of growth and abundance, and Paraíba the electric neon blue-green that is among the most coveted of all. Watermelon tourmaline shows a pink core ringed by green and beautifully balances heart energy, and schorl is the proper name for the opaque black tourmaline we feature for its grounding, protective power.
vs. Similar Stones
Opal’s play-of-color is hard to fake convincingly, but it is sometimes confused with moonstone, which shows a softer, single-color sheen (adularescence) rather than the multicolored flashes of opal. Laboratory-grown opal also exists and can closely mimic the real thing.
Black tourmaline can resemble other dark stones such as onyx, black obsidian, or hematite — all grounding stones, though each carries its own signature. Tourmaline tends to show its characteristic lengthwise striations and a slightly less glassy surface than obsidian, while hematite is noticeably heavier and metallic. Colored tourmalines were historically mistaken for rubies and emeralds, which is part of how the stone earned its reputation as a great pretender.
Real vs. Fake: How to Tell
With opal, watch for doublets and triplets — thin slices of real opal glued to a dark backing and sometimes capped with clear quartz to imitate a solid stone. Viewed from the side, these reveal flat, distinct layers. Solid natural opal shows color that has depth and moves three-dimensionally rather than sitting on a flat plane.
For black tourmaline, genuine stones are firm, take a good polish, and may show fine striations. Suspiciously light, warm-to-the-touch, or perfectly flawless “stones” sold very cheaply may be glass or resin — and they won’t carry the same grounding presence. When the value is significant, a report from an independent gem lab is the surest confirmation for either stone.
October Zodiac Signs
October spans two astrological signs, and both birthstones map onto them beautifully. The month opens under Libra (roughly September 23 to October 22), the sign of balance, harmony, and a love of beauty — opal’s luminous, color-balancing energy is a natural fit, helping Libra stay centered and inspired. It closes under Scorpio (beginning around October 23), the sign of depth, intensity, and transformation — black tourmaline’s protective grounding is perfect for Scorpio, shielding their deep emotional currents and keeping them steady through intense passages. Wearing your birthstone is a simple way to align with your sign’s strengths.
How to Wear It
Black tourmaline is the easy everyday hero. As a bracelet, its matte-to-glossy darkness pairs with almost anything and reads as quiet, intentional, and unisex. Worn on the left wrist, it’s the classic placement for absorbing and clearing incoming energy throughout the day — a small protective anchor that keeps you grounded from morning to night. Explore pieces built around this idea in our Protection & Strength collection.
Opal asks for a little more care. Because it is softer and more delicate, it shines as a feature piece you put on with intention — ideal when you want to invite in creativity, inspiration, or a little luck. A common approach: black tourmaline for daily protection, opal for the moments that deserve a bit of light and magic. The two even work beautifully stacked together — grounded protection and luminous inspiration, side by side.
Caring for It
- Mind the hardness. Opal is relatively soft (about 5.5 to 6.5 on the Mohs scale) and can scratch or crack easily; tourmaline is harder and more durable (about 7 to 7.5).
- Keep opal from drying out. Opal contains water and can craze (develop fine cracks) if exposed to extreme heat, harsh dryness, or sudden temperature changes.
- Avoid chemicals. Remove both stones before cleaning, swimming, or applying perfume, lotion, and hairspray.
- Clean gently. Use a soft, slightly damp cloth and mild soap if needed. Skip ultrasonic and steam cleaners, especially for opal.
- Cleanse and recharge the energy. Black tourmaline works hard absorbing negativity, so cleanse it often — moonlight, sound, or a bed of dry sea salt all work well. Recharge opal under soft moonlight rather than harsh sun.
- Store separately. Keep bracelets in a soft pouch so harder stones don’t scratch your opal.
- Take bracelets off for hard tasks. Gardening, the gym, and heavy lifting are best done bare-wristed.
A Thoughtful October Gift
Two birthstones make October gifting genuinely flexible. For someone who loves color, creativity, and a touch of magic, opal feels personal and special. For someone who prefers understated, grounded pieces they can wear with everything — and the protective energy that comes with them — black tourmaline is the natural pick, and it suits men and women equally well.
A birthstone bracelet also carries a quiet message: I thought about what this month means to you. That intention is what turns a small piece of jewelry into something kept, worn, and treasured for years.
Frequently Asked Questions
Does October really have two birthstones? Yes. Opal is the traditional October birthstone, and tourmaline was added later as a popular modern alternative. Both are widely recognized, so you can choose either — or both.
Which October birthstone is better for everyday wear? Tourmaline, especially black tourmaline, is harder and more durable than opal, which makes it the easier choice for a bracelet worn daily — and its grounding, protective energy is exactly what you want around you every day. Opal is better treated as a more delicate feature piece.
What is black tourmaline good for? Black tourmaline is the go-to crystal for protection and grounding. It’s worn to shield against negative and draining energy, anchor you through the root chakra, and help you stay calm, clear, and centered when life feels chaotic.
Why does opal show rainbow colors? Opal is made of tiny silica spheres arranged in an orderly pattern. They diffract light into spectral colors, producing the shifting play-of-color that opal is famous for — and the reason it’s long been linked to imagination and inspiration.
Is black tourmaline a “real” gemstone? Yes. Black tourmaline, properly called schorl, is a genuine mineral in the tourmaline family. It is opaque rather than transparent, but it is every bit as authentic — and as energetically prized — as its colorful relatives.
A Realistic Note
Crystals are a beautiful, meaningful part of your day, but they are not a substitute for professional medical care. Opal and black tourmaline are not medicines or treatments, and we make no health claims for them — they are not intended to diagnose, treat, cure, or prevent any medical condition. If you’re dealing with a health concern, please speak with a qualified professional.
Final Thoughts
October’s two stones tell two stories. Opal is light, imagination, luck, and a little wonder caught in glass. Black tourmaline is protection, grounding, and a steady calm you can wear on your wrist every single day. You don’t have to choose just one — many people love having both, pairing luminous inspiration with rock-solid grounding.
If the grounded, protective side speaks to you, our Protection & Strength collection is a good place to begin. Whichever you choose, let it be a piece you genuinely love — that connection is what makes a birthstone worth wearing.