PERIDOT. THE LEO BIRTHSTONE COLOR GIVES STRENGTH AGAINST NEGATIVITY AND STRESS. Those born in August, or under the star sign of the lion, have Peridot as their birthstone color, like the gemstone that shares the same name. This stunning olive-green stone was treasured by the ancient Pharoahs, who believed it brought them closer to nature, fostered friendships, attracted love, and brought happiness. Among the benefits of the mesmerizing Peridot color is its ability to reduce stress and anger.