Whether or not it's worth restringing a pearl necklace depends on a few factors:

The value of the pearls: If the pearls are of high value, either sentimentally or monetarily, it may be worth it to restring the necklace to maintain its quality and appearance.

The condition of the necklace: If the necklace is in good condition and the pearls are still secure, you may not need to restring it. However, if the thread is stretched, frayed, or damaged, it may be necessary to restring the necklace to prevent it from breaking and potentially losing pearls.

How often you wear the necklace: If you wear the necklace frequently, it may be more prone to wear and tear, which could make restringing it a worthwhile investment.

In general, restringing a pearl necklace can help to preserve its appearance and extend its lifespan. However, it's important to consider the cost of restringing compared to the value of the necklace before making a decision. Additionally, if you're uncertain about whether restringing is necessary or if you don't feel comfortable doing it yourself, it's best to consult a professional jeweler.

If you do decide to restring your pearl necklace, there are a few things to keep in mind. First, choose a high-quality thread that is strong enough to hold the weight of the pearls. Silk thread is a common choice for restringing pearl necklaces because it is strong, flexible, and soft, which helps to prevent the pearls from rubbing against each other and becoming damaged.

When restringing your necklace, it's important to use knots between each pearl to keep them in place and prevent them from rubbing against each other. You can also add a small knot or bead at the clasp to keep the pearls from slipping off the end of the necklace.

If you're not comfortable restringing your own necklace, it's best to take it to a professional jeweler. They will have the experience and tools necessary to restring your necklace safely and effectively, and can also inspect the pearls to ensure that they are in good condition.

In addition to restringing, it's also important to care for your pearl necklace properly to help maintain its quality and appearance. Avoid exposing your pearls to chemicals, perfumes, and other substances that could damage them, and store them in a soft pouch or cloth to prevent scratches and other damage.

By taking good care of your pearl necklace and addressing any issues promptly, you can help ensure that it remains a cherished piece of jewelry for years to come.