Differences freshwater pearls Generally speaking, freshwater pearls are not round such as sea water pearls, and they do not have the sparkle sharp as akoya pearls (saltwater pearls, but differ with south sea pearl). However, they appear with different shapes and natural colors, and they tend to be less expensive than saltwater pearls, make them very popular among young jewelry designer. Also, because it has a density of freshwater pearl nacre, they are also quite durable, resistant to rupture.