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.
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