October Birthstone Guide: Opal & Tourmaline

If you or someone you love has an October birthday, you get two of the most colorful birthstones on the calendar: opal and tourmaline. Opal is the dreamlike stone that flashes every color of the rainbow from within, and tourmaline comes in a broader range of colors than almost any other gem, sometimes several at once in a single crystal. Between them, October is the month for anyone who loves color and individuality in their jewelry.

This guide walks through why October has two birthstones, the meaning and lore behind each, the practical knowledge you’ll need to evaluate them, and how to think about October birthstone jewelry as both an everyday piece and a long-term family heirloom.

Why October Has Two Birthstones

The modern birthstone list was standardized by the American National Retail Jewelers Association, now Jewelers of America, in 1912, with opal as October’s stone. Tourmaline was added later as an additional October birthstone, a natural fit given its endless range of colors. The result is a month with two stones that share a love of color but could hardly be more different in how they produce it: opal through an internal optical effect, tourmaline through the crystal itself.

Each carries its own history. Opal’s name likely traces to the Sanskrit upala, “precious stone,” and the Roman opalus. The Romans prized it above almost all gems; later superstition briefly cast it as unlucky, largely thanks to a 19th-century novel rather than any real tradition. Australia, which produces the majority of the world’s fine opal, made it their national gemstone. Tourmaline was often confused with other gems for centuries (its name comes from the Sinhalese turmali, a term once used for mixed colored stones) and it wasn’t recognized as its own mineral family until relatively recently.

Opal is the traditional gemstone for the 14th wedding anniversary, and tourmaline for the 8th, giving October’s stones milestone meaning beyond a birthday.

The Meaning and Symbolism of October’s Birthstones

Each of October’s two stones carries its own symbolism:

• Opal: creativity, inspiration, and hope. Its shifting internal fire has tied it to imagination, emotional expression, and the idea of containing all gemstones’ colors at once.
• Tourmaline: balance, protection, and healing. Long believed to promote emotional balance and guard against negativity, tourmaline is associated with confidence and grounding.

Together they make October rich for anyone who likes meaning and individuality in their jewelry: the dreamy fire of opal and the endless color range of tourmaline.

How to Actually Evaluate October’s Birthstones

Opal and tourmaline are judged on completely different terms, one on its play-of-color, the other on the quality of its body color.

Opal

Opal is prized for play-of-color, the flashing rainbow hues that shift as the stone moves, caused by the way light diffracts through microscopic silica spheres. It is soft (5.5 to 6.5 on the Mohs scale) and contains water, so it needs gentle care. What matters most:

• Play-of-color, the brightness, range, and pattern of the color flashes. Broad, vivid, multicolor flashes are most prized; red is the rarest and most valuable flash color.
• Body tone. Black opal (dark body) shows play-of-color most dramatically and is the most valuable; white or light opal is more common; crystal opal is transparent to translucent with play-of-color throughout.
• Pattern. Distinct, well-organized patterns (such as the rare “harlequin”) command premiums over random speckling.
• Type. Solid natural opal is most valuable; doublets and triplets (thin opal layers bonded to backing) are more affordable but should be disclosed. Beware of dyed or treated material.

Tourmaline

Tourmaline is valued mainly for its body color, and it offers more color variety than almost any gem. It rates 7 to 7.5 on the Mohs scale, durable enough for most jewelry. What matters:

• Color, the biggest value driver. Vivid, saturated colors are most prized. Certain varieties command large premiums: Paraiba tourmaline (electric neon blue-green, colored by copper) is among the most valuable colored stones in the world, and fine “rubellite” (vivid red-pink) and chrome green are also highly sought.
• Bi-color and watermelon. Some crystals show two or more colors in one stone; “watermelon” tourmaline (pink center, green rim) is especially popular when cleanly cut to show the zoning.
• Clarity. Eye-clean stones are preferred, though some varieties (like rubellite) commonly carry inclusions.
• Cut and carat. Skilled cutting maximizes color, which can vary with the crystal’s direction; clean stones in fine colors climb in price with size.

Alternative October Birthstones

Between opal and tourmaline, October already offers enormous range, but a few related options are worth knowing:

• Pink tourmaline, often singled out as a traditional October alternative and a softer, romantic choice.
• Lab-created opal. Offers vivid play-of-color at a lower price and greater durability, though natural opal is far more prized.
• Rose zircon or pink sapphire, durable pink stones for those who love tourmaline’s rosy tones but want a harder stone for daily-wear rings.

Each has a different character. For a durable everyday ring, tourmaline or a harder pink alternative is the safer choice; opal rewards those who’ll give it gentle care.

Choosing an October Birthstone in Hawaii

Opal in particular rewards seeing in person more than almost any other stone. Its play-of-color simply cannot be captured in a single photograph, since the whole point is how the fire moves as the stone turns. Tourmaline’s color, too, can shift with the viewing direction and lighting.

At Jewel Box Hawaii, we work with vetted suppliers and disclose the nature and any treatment of every stone (solid opal versus doublet or triplet, and natural versus treated tourmaline). We encourage clients to view October’s stones in person and in motion, especially opal, where a catalog photo tells only a fraction of the story.

Caring for Opal & Tourmaline in the Islands

October’s two stones sit at different ends of the durability scale, and Hawaii’s sunscreen, salt water, and sand are hard on any jewelry, especially on soft, water-bearing opal:

• Opal is soft and delicate: handle with care. Never use ultrasonic or steam cleaners; the heat and vibration can crack it. Clean only with a soft, damp cloth.
• Protect opal from extreme dryness and sudden temperature changes. Because opal contains water, very dry conditions or rapid heat changes can cause “crazing” (fine surface cracks). Avoid leaving it in a hot car or in direct heat.
• Keep opal out of the ocean and pool, and take it off before applying sunscreen or chemicals. Salt water and impact are especially risky for such a soft stone.
• Tourmaline is more forgiving. At Mohs 7 to 7.5 it tolerates warm water, mild soap, and a soft brush. Avoid ultrasonic cleaning for included stones, and rinse off sunscreen buildup.
• Store opal separately so harder stones don’t scratch it.

Cleaning, resetting, and general maintenance are part of our restoration and heirloom care services, particularly valuable for delicate opals and heirloom pieces that have been in the family for years.

Gift Ideas for an October Birthday

If you’re shopping for someone with an October birthday, a few directions worth considering:

• Opal pendant or earrings. Pieces that face less impact than rings suit opal’s softness, and let the play-of-color shine. A protective bezel setting is ideal.
• A custom-designed piece featuring tourmaline or opal. Tourmaline’s color range makes it perfect for personalizing to a favorite shade, and opal set protectively makes a dreamy statement. We routinely design around a single special stone.
• Tourmaline for a durable everyday piece. A vivid pink, green, or bi-color tourmaline ring stands up to daily wear better than opal and offers a personal pop of color.

Schedule a Consultation

Whether you’re choosing an opal for its fire, hunting for a vivid tourmaline, or designing a piece around an October birthday, we’d be glad to help. Browse our gemstone inventory or schedule a consultation to start a conversation.