It's recommended to restring pearls about every 3-5 years of regular wear. Pearls worn frequently or with stretchier silk string may need restringing more often than those worn only occasionally. Signs your pearls need restringing include loose strands, pearls feeling unevenly spaced or scattering across the necklace, and visible knots showing between pearls. Restringing helps maintain the structure, beauty, and value of pearl necklaces over decades of wear.