The October birthstone is opal, with tourmaline as its modern second choice. Opal is known for play of color, flashes of rainbow light that move as you turn the stone. Tourmaline comes in nearly every hue, and pink tourmaline is the favorite for October gifts. Both are traditionally linked with creativity, emotion and change.
The stones
Color: Multicolor, pink · Birth flower: Marigold, cosmos
If you were born in October, you are one of the lucky few with a choice. Most months have one stone, but October has two that look nothing alike: opal, which seems to hold a small storm of colored light inside it, and tourmaline, which grows in more colors than almost any other gem.
People searching for the October birthstone are often shopping for a gift, picking a ring, or just wondering why opal has a strange reputation for bad luck. This page covers both stones: what they are made of, what their colors are, what they traditionally symbolize, where the old opal superstition actually came from, and how to wear and look after them so they last.
October birthstones: opal and tourmaline
The modern list used in the United States, kept by the American Gem Society and Jewelers of America, names two October birthstones: opal and tourmaline. You may wear either one, or both together.
Opal is the traditional October stone and the one most people think of first. It is a form of hydrated silica, not a crystal in the strict sense, and it ranks only about 5.5 to 6.5 on the Mohs hardness scale, so it is a softer, more delicate gem. Tourmaline is a family of boron silicate minerals that rates 7 to 7.5, tougher and better suited to everyday rings.
Why two stones? Birthstone lists were never handed down from one ancient source. They were standardized by the jewelry trade in 1912 and revised since, and later lists added alternatives so buyers had more choice, more colors and more price points. Opal can be costly and fragile, while tourmaline offers a wider range of budgets. Tourmaline joined the October entry in the twentieth century.
You will also see pink tourmaline named on its own, since it is the version most shops stock for October. It is a variety of tourmaline, not a separate birthstone.
October birthstone colors
Opal is the one gem whose color depends on how you hold it. Precious opal shows play of color: flashes of red, orange, green, blue and violet that slide across the surface as the angle changes. The body color behind those flashes can be white, pale gray, black, or warm orange (fire opal). Black opal, whose dark body makes the colors glow, is the most prized.
Tourmaline spans almost the whole spectrum. For October gifts, pink tourmaline is the classic: a soft rose-pink that reads as the modern companion to opal. Deeper red tourmaline is called rubellite, and watermelon tourmaline shows a pink center with a green rim like a slice of the fruit.
So there is no single October color. If you want one answer, think of rainbow and pink: opal's multicolored fire and tourmaline's rose. Both lean warm and lively, which suits an autumn month.
October birthstone meaning and symbolism
In crystal lore, the meaning of opal centers on creativity, imagination and emotional expression. Because its colors never sit still, many people see it as a symbol of change and of feelings that shift from day to day. It is often chosen by artists, writers and anyone who wants a reminder to stay curious.
The ancient Romans, according to Pliny the Elder, admired opal as a gem that gathered the colors of other stones, and that idea of many things in one is still part of how people describe it.
Tourmaline is traditionally associated with balance and with openness of the heart, especially in its pink form. Many people use pink tourmaline as a reminder to be gentle with themselves and kind to others. Its range of colors has made it a stone of variety and acceptance.
Together, the two stones suggest that October is about color, feeling and transition, a fitting match for the month when the leaves turn. None of this is science, and crystals are not a substitute for medical or mental health care. Think of the symbolism as a prompt for reflection that you are free to take or leave.
History of the October birthstone and the opal superstition
The word opal passes through Latin opalus and Greek opallios, and probably traces back to a Sanskrit word for precious stone. Pliny the Elder wrote that opal combined the fire of carbuncle, the purple of amethyst and the green of emerald, and he told of a Roman senator, Nonius, who chose exile over giving up his opal to Mark Antony. In 1912 the National Association of Jewelers, now Jewelers of America, published a birthstone list with opal for October. Tourmaline was added later.
The link to the Breastplate of Aaron, the Biblical garment with twelve stones, is a popular story but is debated, and opal is not clearly identified in the biblical lists.
Then there is the unlucky opal. The superstition is often blamed on Sir Walter Scott's 1829 novel Anne of Geierstein, in which a mysterious woman wears an opal that loses its fire after holy water touches it, and she soon dies. Gem historians doubt the book alone caused the belief, since in the story the opal is not simply cursed. Opal was also loved in the nineteenth century, and Queen Victoria is said to have given opal jewelry. Today the superstition is mostly a curiosity.
Choosing and caring for October birthstone jewelry
For daily wear, tourmaline is the practical pick. A pink tourmaline ring or pendant holds up well and costs far less than a fine opal. Opal suits earrings, pendants and occasional rings that will not take hard knocks.
Budget-friendly options include opal doublets and triplets, where a thin slice of opal is backed by another material, and smaller tourmaline stones. Lab-created opal and simulants exist, so ask sellers to say plainly what you are buying.
Opal care matters because the stone contains water:
- Keep it away from heat, a hot car dashboard and very dry air, which can cause cracks.
- Avoid sudden temperature changes, ultrasonic cleaners and harsh chemicals.
- Wipe gently with a damp soft cloth and dry it. Do not soak doublets or triplets.
- Store it apart from harder gems that could scratch it.
Tourmaline is easier: warm soapy water and a soft brush are usually enough.
October zodiac signs and their stones
October covers the end of Libra (through about October 22) and the start of Scorpio (from about October 23). Zodiac stone lists vary a great deal from source to source, so this is tradition rather than rule.
Opal is the stone most often linked with Libra, partly because Libra is the sign of balance and beauty, and opal blends many colors into one harmony. Pink tourmaline is sometimes offered to Libra for the same reason.
For Scorpio, lists commonly mention opal as well, along with garnet, topaz and black tourmaline. Black tourmaline is a favorite of people who like an intense, grounded stone, which fits Scorpio's reputation for depth and privacy.
You do not need to follow a chart. Choose the stone whose color you like to look at.
Frequently asked questions
What is the October birthstone?
The October birthstone is opal, and tourmaline is the modern second option. Opal is the traditional stone, famous for its play of color. Tourmaline, especially pink tourmaline, is a tougher and often cheaper alternative. Jewelers of America and the American Gem Society both list the two together, so you can choose either.
What color is the October birthstone?
There is no single color. Opal flashes rainbow colors against a white, black or orange body, while tourmaline appears in nearly every shade, with pink the most popular for October. If you want one answer, choose multicolor for opal or rose-pink for tourmaline.
Is opal bad luck for October babies?
No. The idea that opal is unlucky is a superstition, often traced to Sir Walter Scott's 1829 novel Anne of Geierstein, though historians say the book was not the only cause. Opal has long been admired, and it is the traditional stone for people born in October.
What does the October birthstone mean?
In crystal lore, opal is associated with creativity, imagination and changing emotions, while tourmaline, especially pink, is associated with balance and an open heart. These meanings are tradition and symbolism, not science, and a stone cannot replace medical or mental health care.
What is the October birth flower?
The October birth flowers are the marigold and the cosmos. Marigolds bring warm orange and gold tones that echo fire opal, while cosmos blooms are often pink, which pairs nicely with pink tourmaline. Many people combine the flower and the stone in a gift.
Angel number meanings are for reflection and inspiration. They are not predictions, and they are not medical, legal or financial advice.