Thought to hold lightning fallen from the sky, opals are known for their dramatic rainbow "play-of-color," and have been likened to miniature galaxies and fireworks. 
In some cultures, the shifting colors of this precious stone have been linked to mystical superstition and prophecy, while in others, they are viewed as therapeutic and representative of truth, hope, and virtue. The brilliance and iridescence of opals are thought to embody the changing colors of fall, making it a natural birthstone for the month of October.

“I'm so glad I live in a world where there are Octobers.

 L.M. Montgomery, Anne of Green Gables