Are freshwater pearls not waterproof? Yes, freshwater pearls are naturally formed in water and are waterproof. However, there are a few considerations when it comes to exposing them to water:

Chemicals and Additives: Freshwater pearls are sensitive to chemicals. Chlorinated water in swimming pools, salt in seawater and sweat, and even the chemicals in some soaps and shampoos can harm a pearl's luster and surface

Stringing Materials: If freshwater pearls are part of a necklace or bracelet, the stringing materials, knots, or other components may be adversely affected or weakened by prolonged exposure to water

Drying: If freshwater pearls do get wet, they should be gently dried with a soft cloth.

So, while freshwater pearls originate from water and can handle some moisture and withstand some exposure to water, it's generally recommended that you avoid getting them wet whenever possible. Water and sweat tends to weaken the silken threads that are used to string strands of pearls and coral necklaces. Here is a quick care guide for to keep your pearls shiny and new:

Gentle Cleaning: Use a soft, damp cloth to gently wipe your freshwater pearls after wearing them. This removes any traces of perfume, cosmetics, or perspiration which can harm the pearl's luster.

Avoid Chemicals: Keep pearls away from harsh chemicals, including chlorine, household cleaners, and even personal cosmetics like hairsprays and lotions. Always apply your cosmetics, hairspray, and perfume before putting on your pearls.

Storage: Store freshwater pearls separately from other jewelry, preferably in a soft-lined pouch or box. This prevents scratches and maintains the pearl's integrity

Wear Regularly: Pearls benefit from the natural oils on our skin. Wearing them often keeps them lustrous. However, ensure they're the last thing you put on and the first thing you take off.

Restringing: If you wear pearl necklaces frequently, consider restringing them  whenever the string becomes loose, to prevent potential breakage.