Some of our customers wrote to us asking the questions about restringing the pearl necklace. In fact, it is a good maintenance to re-string your pearl necklace once every 2 or 3 years, depending on the times or frequency that you wearing.
As the time goes on, the dirt will adhere between pearl beads or in the holes of the beads, these dirt will produce frictions which lead to the breakdown of the line. And those breakdown point are mostly close to the clasp.
Do remember not hang your pearl necklace for a long time, the long chain will deform or breakdown. Make a knot between every two pearl beads is a good idea to prevent the frictions between them. Even if the line is broken, the beads will not spread out and you just lose one of them.