august is the month of abundance and prosperity, and what better way to celebrate than with a birthstone charm? our serendipity august birthstone charm flourishes in the power of peridot. peridot is said to promote abundance, prosperity, and well-being. add it to your favorite necklaces and bracelets to celebrate the abundance of life. this charm fits over most necklaces and the internal diameter is approximately 2.8 x 2.2 mm.