Pearls should be strung periodically to ensure the silk string hasn't stretched which compromises the jewelry. You should inspect your pearls before each wear and check whether the silk string has stretched over time. When you notice the pearls moving freely between knots, it is time to have you pearls restrung.
It is completely normal for pearl strands to stretch and need restringing. It is a simple task and helps to avoid damage or loss of your pearls due to breakage.
Pierre&Harry offers restringing services. Prices vary per inch depending on the type/size of pearl and length of the strand, etc. Please contact Cullen@PierreandHarry.com for restringing information and individual pricing. We also offer a variety of beautiful clasps if you wish to change the clasp on your piece.