The birthstone for August is Peridot. Peridot is a beautiful gemstone that is known for its olive-green color. It is a form of the mineral olivine and is formed deep within the Earth's mantle. Peridot is often associated with strength, positivity, and good fortune. It is believed to bring protection and healing properties to the wearer. In addition to Peridot, some sources also mention Sardonyx as an alternative birthstone for August. Sardonyx is a type of onyx with bands of brownish-red and white colors. Both Peridot and Sardonyx are used as birthstones for August, and they make excellent choices for jewelry pieces like rings, necklaces, and bracelets for those born in this month.