Jewelry IdentifierBirthstone
October Birthstone
October has two birthstones: opal, famous for its play-of-color, and tourmaline, the most color-diverse gem.
Opal
Mohs 5.5–6.5Shows flashing 'play-of-color'; softer and more delicate than most gems.
Tourmaline
Mohs 7–7.5Comes in the widest color range of any gem, including bi-colored 'watermelon.'
- Modern birthstone
- Opal, Tourmaline
- Traditional / alternates
- Pink tourmaline
- Color
- Iridescent / multi
Born in October? You have two birthstones: opal, which flashes rainbow colors as it moves (play-of-color), and tourmaline, which occurs in more colors than any other gemstone — including the pink-and-green 'watermelon' variety.
What the October birthstone means
October's stones symbolize hope, creativity, and inspiration.
Is your October birthstone real?
Birthstones are among the most-imitated gems — opal especially is often simulated by glass or synthetics. The fastest way to check what you actually have is to photograph the stone and run it through the free Gemstone Identifier, then confirm whether it's natural with the Is It Real? tool. For what a piece is worth, get a free jewelry appraisal.
Frequently asked questions
Birthstones by month
Not sure if your opal is real?
Upload a photo for a free instant identification and value estimate — no sign-up needed.