1. Use an extension chain: buy an extension chain that matches the pearl necklace and connect it to the universal buckle to increase the length of the necklace. The integrity of the necklace can be maintained, and the length can be freely adjusted as required.

2, replace the buckle: there are some basic jewelry repair skills, you can replace a longer universal buckle. You can buy a suitable clasp and install it on the necklace with the right tools.