the start of a new year is a time for fresh beginnings, and what better way to celebrate than with a birthstone charm? our serendipity january birthstone charm marks the moment with garnet. garnet is said to promote strength, passion, and success in all aspects of life. add this charm to your favorite necklaces and bracelets to embrace the power within you. this charm fits over most necklaces and the internal diameter is approximately 2.8 x 2.2 mm.