Seawater pearls, also known as Haizhu and Nanzhu, are cultivated by Marsh's shell. They are cultured in the deep sea. They have bead cores. The shape of the beads is very round. The pearls are more round and valuable. Freshwater pearls are cultivated by spinnakers and cultured in lakes. It is non-nuclear, and the shape of the beads is rarely round, and most of them are elliptical, oblate, drop-shaped or irregular. Therefore, seawater pearls are worth more than freshwater pearls. Seawater pearls contain a variety of trace elements, and the gloss is good. The freshwater pearls contain relatively few trace elements, and the gloss is relatively poor. The amino acid content of seawater pearls accounts for 27%, and the freshwater pearls have an amino acid content of 7%.
The production of seawater pearls is very low. One pearl can only produce one pearl. It can be harvested once a year. The breeding process is extremely difficult and the cost is high. The yield of freshwater pearls is high. One pearl produces more pearls and the cost is relatively low.
1. Form: The seawater pearls generally have a relatively regular spherical shape, while the freshwater pearls are more elliptical, oblate, and have more surface pleats;
2, size: seawater pearls are generally larger than freshwater pearls, the diameter of seawater pearls is generally 6--7.5 mm, while the particles of freshwater pearls are much smaller;
3. Density: Generally, the density of seawater pearls is less than that of freshwater pearls;
4. Growth cycle: the growth cycle of common seawater pearls is three years, while freshwater pearls are one to two years;
5. Survival rate: The survival rate of common seawater pearls is 50%, and only 40% of the pearls in this range; the survival rate of freshwater pearls is much higher;
6, pearl production: generally three sea pearl motherfish produce a pearl, and a freshwater pearl mother can form about 20 pearls;
7. Growing environment: Seawater pearls are more likely to grow in open natural seawater (with more nutrients and plankton inside), while freshwater pearls are more likely to grow in relatively closed waters;
8. Medicinal effects: The content of medicinal ingredients of seawater pearls is generally higher than that of freshwater pearls, and the medicinal value is higher.
Last but not least, due to the development of China in the past ten years, environmental pollution has become more and more serious. In addition, freshwater aquaculture mainly relies on feed, high yield but high content of inorganic substances in its products, and it has a beauty and health care function. The organic matter content is very low.
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