spring is a season of growth and renewal, and what better way to celebrate than with a birthstone charm? our serendipity march birthstone charm marks the beginning of a new season with aquamarine, which is said to promote courage, communication, and self-expression. add it to your favorite necklaces and bracelets to embrace your inner strength. this charm fits over most necklaces and the internal diameter is approximately 2.8 x 2.2 mm.