October has two recognized birthstones—opal and tourmaline—and both are famous for color. Opal can display play-of-color, while tourmaline occurs in one of the broadest color ranges in the gem world.

What Are the October Birthstones?

Opal is the traditional October birthstone, while tourmaline is the modern alternative. Because both can display many colors, October has no single mandatory birthstone color.

Opal

Precious opal can show shifting flashes of spectral color called play-of-color. The effect varies dramatically from stone to stone. Opal can also occur without play-of-color, and assembled or synthetic opal products should be disclosed accurately.

Tourmaline

Tourmaline comes in a remarkably broad palette. Pink and red rubellite, green tourmaline and blue-green varieties are among the best known. Some crystals show more than one color in the same stone.

Opal vs Tourmaline: Which Should You Choose?

Choose opal if you love an iridescent, changing appearance. Choose tourmaline if you want a more conventional transparent colored gemstone with a wide palette. For rings, consider the setting and wear habits because rings receive more impact than pendants or earrings.

October Birthstones in Sterling Silver

Bright silver creates strong contrast with pink tourmaline, green tourmaline and colorful opal. A cool silver setting can also make blue and violet flashes appear especially crisp.

How to Shop Carefully

Read the material description. “Opal-style,” “opal color” and genuine opal are not the same thing. Likewise, colored cubic zirconia should not be presented as tourmaline simply because the shade is similar.

Frequently Asked Questions