October Birthstone: Opal Meaning, History & Jewellery Guide
If you're born in October and you're Australian, your birthstone could not be more on-brand: the opal is Australia's national gemstone, and the vast majority of the world's precious opal has come out of Australian ground. No other month's stone belongs to this country the way October's does.
What is the October birthstone?
October's primary birthstone is the opal, with tourmaline as the recognised alternative — fitting company, since both stones are celebrated for showing many colours at once.
Opal meaning and symbolism
Opal has long symbolised hope, creativity and originality — natural associations for a stone in which every example is genuinely one of a kind. Ancient Romans considered opal the most precious of all gems because it seemed to contain the colours of every other stone at once; its name likely traces back through Latin opalus to words meaning "precious stone".
You may have heard opal called unlucky — that's a 19th-century superstition popularised by a Walter Scott novel, not ancient tradition, and the Australian opal industry has spent a century cheerfully disproving it. (October babies can wear theirs with double immunity.)
What makes opal unlike any other gem
Opal is hardened silica containing a little water, built from microscopic spheres. When those spheres stack in orderly patterns, they diffract light into the shifting rainbow flashes called play-of-colour — the thing that makes precious opal precious. Because no two stones have the same internal structure, no two opals are alike, and the pattern you're holding exists exactly once in the universe.
The Australian opal story
Australia produces most of the world's precious opal, from fields whose names are part of national folklore: Coober Pedyin South Australia (white opal, and the town where summer heat drove miners to live underground), Lightning Ridge in NSW — the home of rare and valuable black opal, whose dark body makes the colour play blaze — and Queensland's boulder opal fields, where opal forms in seams through ironstone. Black opal from Lightning Ridge is among the most valuable opal on Earth.
A note for buyers: opals are sold as solid opal, or as doublets and triplets — thin slices of real opal layered onto a backing (and capped with clear quartz, for triplets). Doublets and triplets make the look far more affordable and are perfectly legitimate, but they should always be labelled as what they are, and they need to be kept away from prolonged water exposure, which can cloud the layers.
The other October birthstone: tourmaline
Tourmaline occurs in more colours than almost any gem — including watermelon stones that shade pink-to-green in a single crystal. It's a great choice for an October person who wants a faceted, conventional-looking gem, and at 7–7.5 Mohs it's a little tougher for ring wear than opal.
Choosing opal jewellery
Opal is soft by gem standards (5.5–6.5 Mohs) and contains water, so the golden rule is: match the piece to the wearer. Pendants and earrings are ideal homes — protected positions, maximum visibility for the colour play; see our necklaces, earrings and gemstone jewellery. Rings should be for occasional wear, ideally in protective bezel settings. For gifts, the one-of-a-kind angle is the story — no other October present can claim it. Browse the birthstone jewellery range or shop by budget from gifts under $100.
How to care for opal
The most care-sensitive stone in the birthstone year, so this section earns its keep:
- No ultrasonic cleaners, ever. Warm water, mild soap, soft cloth only.
- Avoid heat and dryness extremes — opals contain water, and sudden changes can craze (fine-crack) them.
- Doublets and triplets shouldn't be soaked — wipe rather than immerse.
- Store gently, away from harder jewellery, ideally in a soft pouch.
- Take opal rings off for housework, gym and gardening — opal will lose every argument with a hard surface.
Frequently asked questions
What is the birthstone for October?
Opal is October's primary birthstone, with tourmaline as the recognised alternative.
What does the opal birthstone mean?
Hope, creativity and originality — fitting for a gem in which no two stones are alike.
Why are opals associated with Australia?
Australia produces most of the world's precious opal and opal is the country's national gemstone, mined at famous fields including Coober Pedy, Lightning Ridge and the Queensland boulder fields.
Are opals unlucky?
No — the superstition comes from a 19th-century novel, not gem tradition. Opal was considered among the luckiest of stones for most of history, and it's simply the birthstone for October.
Can you wear opal every day?
In earrings or a pendant, yes. Opal rings are better for occasional wear or protective settings, as opal is softer than most gems and sensitive to knocks and harsh chemicals.
Shop this birthstone
Looking for the perfect piece? Explore our opal jewellery collection — earrings, pendants and rings, each one truly one of a kind. A pendant or earrings show off opal's colour play while keeping this softer stone protected.
Prefer to browse everything in one place? Visit our birthstone jewellery hub to shop by any month. Free express shipping on orders over $99, with Afterpay and Zip available.
Find your birthstone by month
Every month has its own gem. Explore the full series:
January - Garnet · February – Amethyst · March – Aquamarine · April – Diamond · May – Emerald · June – Pearl · July – Ruby · August – Peridot · September – Sapphire · November – Topaz & Citrine · December – Turquoise, Tanzanite & Zircon