The main August birthstone is peridot , a bright yellow‑green gemstone traditionally associated with people born in August.

In modern birthstone lists, August actually has three official stones:

  • Peridot – the primary and most widely recognized August birthstone, a green gem from the mineral olivine, linked with protection and vitality.
  • Spinel – added in 2016 as a modern August birthstone, found in many colors and valued for its brilliance.
  • Sardonyx – the original August birthstone from ancient times, a banded stone symbolizing courage, stability, and clear communication.