Leizhou has been rich in pearls since ancient times. "Lingnan sees the record" records: "The rumor is thunder and pregnant, looking at the moon and the tires." Liusha Nanzhu is famous at home and abroad. Its roundness is dignified and crystal clear, which is favored by the domestic and international jewelry circles. Therefore, it is said that “Dongzhu is not as good as Xizhu, and Xizhu is not as good as Nanzhu”.

Technical requirements for quality of Liusha Nanzhu (1) Seedling breeding technology. 1. Pro-Bei selection: Select the natural breeding or artificial breeding of the original sea area 2 to 3 years old, the shell is up to 6cm, the shell is intact, the body is strong, the pearl is silvery white, and the gonad is full of high quality Marsh's mother-of-pearl. 2. Breeding conditions: The nursery farm should have a perfect water supply filtration system. The nursery pond should have windproof, leakproof, shading and aeration equipment, and must be equipped with a bait culture system. 3. Nursery management: oxytocin, hatching and shellfish cultivation should be carried out under the conditions of water temperature of 25 ° C to 30 ° C and salinity of 25 to 35. During the nursery period, we must ensure excellent water quality, adequate food and scientific management. (2) Mother-of-pearl cultivation technology. 1. Develop the choice of sea area: choose the calm sea, the trend is smooth, the water quality is not polluted, the bottom quality is stable, and the plankton is rich in sea food. 2. Water quality conditions: water temperature 15 ° C to 30 ° C, salinity 20 to 35, pH 7.8 to 8.4. 3. Breeding method and density: the mother-breeding method adopts standing stakes and floating rafts, and the breeding density is per hectare. 200,000 to 300,000. 4. Specifications: The cultivation period is more than 1 year and a half, and the shell height is 6cm or more. (3) Mother-of-pearl insertion technology. 1. Maternal quality requirements: should be 1.5 to 2 years old, shell height of 6cm or more, strong physical and disease-free. 2. Preoperative treatment of Shizhu: Before surgery, the physiological function of the mother's gonads should be adjusted to reduce the stress response of the mother, and to improve the survival rate, retention rate and pearl quality. 3. Inserting the nuclear operation: Correctly grasp the nuclear position, and the cell pieces are close to the bead core. 4. Seasonal selection: choose from April to June in the first half of the year and September to November in the second half. 5. Raised in a sea area where the wind and waves are calm, the water flow is slow, the environment is stable, and the bait is sufficient. The water temperature is 20 °C to 28 °C, the salinity is 22 to 32, and the rest time is about one month. (4) Yuzhu technology. 1. The environment of the Yuzhu site: the calm and calm, the trend is smooth, the water quality is not polluted, the plankton is rich in bait, and the bottom quality is stable. The water depth requires more than 5m, the water temperature is 15°C to 30°C, and the salinity is 20 to 35. 2. The management of the beading: According to the changes of the season and the water temperature, the water layer should be adjusted in time, and the cage should be cleaned and replaced frequently. 3. Beading time: The beading period is required to be more than one year, and the thinnest bead layer is greater than 260 μm. (5) Harvesting and processing technology. 1. Harvest season: The harvest season should be carried out at the beginning of winter and early spring, and the water temperature is 18 °C to 22 °C. The pearl quality is the best. 2. Harvesting treatment: After harvesting the pearls, after removing the beads, they should be rinsed, dried and preserved, waiting for processing or sold as raw material beads. 3. Processing: After the pearl is harvested, it must undergo a series of processing steps such as selection, drilling, degreasing (decontamination), whitening, and coloring. 4. Classification and grading: After processing in the above process, classification and grading according to the specifications, shape, color, gloss and jewelry style of the pearl.

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Producers within the scope of protection of Liusha Nanzhu Geographical Indication Products may submit an application to the Leizhou Municipal Bureau of Quality and Technical Supervision for the use of “Special Marks for Geographical Indication Products”, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.