Why high quality freshwater pearls luster closed to saltsea pearl?

1. Plankton in seawater is better than plankton in freshwater. Plankton determines the luster of pearls, making them more delicate. -- Freshwater aquaculture farms use seaweed for feeding, just like seawater pearls.

       2. Seawater is colder than freshwater, so seawater pearls grow more slowly. -- Freshwater aquaculture farms now use cold water, at depths of 5 meters rather than 2 meters, the typical depth, to produce pearls with a luster close to that of seawater pearls.