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ZH Gems chinese turquoise jewelry During the production of chinese turquoise jewelry, Shenzhen Hong Zheng Technology Limited divides the quality control process into four inspection stages. 1. We check all incoming raw materials before usage. 2. We perform inspections during the manufacturing process and all manufacturing data are recorded for future reference. 3. We check the finished product according to the quality standards. 4. Our QC team will randomly check in the warehouse before shipment. wholesale gemstone beads from china,buy gemstones and crystals,gemstone chips wholesale.