For all of those with an August birthday, your lucky enough to have three birthstones! Peridot, Spinel and Sardonyx. Sardonyx is the original birthstone for August, with history that dates back to more than 4,000 years. It is a combination of alternating layers of sard and onyx to create a reddish zebra-striped gemstone with white bands. Spinel is a birthstone, which is underappreciated until recently and comes in a wealth of colours; intense red, vibrant pink, orange, purple, blue and bluish green. Peridot is a gorgeous colour of yellow and green.