Modern

• Modern birthstones are in a list that was formed by Jewelers of America in 1912. The modern birthstones for October are opal and tourmaline.
  
  

Traditional

• The traditional birthstone for October is aquamarine in the Arabic, Hebrew, Polish and Roman cultures. It is coral in Hindu culture and beryl in Italian and Russian cultures.
  
  

Zodiac

• The birthstone for October according to the zodiac covers two different signs: Libra (September 24 through October 23) and Scorpio (October 24 through November 22). Peridot is associated with Libra and Scorpio is associated with beryl.
  
  

Mystical

• Mystical birthstones originate in Tibet. The mystical birthstone for October is jasper.
  
  

Ayurvedic

• Ayurvedic birthstones come from India. The Ayurvedic birthstone for October is opal.