Hainan Provincial Bureau of Quality and Technical Supervision and Hainan Provincial Institute of Metrology. Haikou Jewelry Appraisal Center is located in Science and Technology Building of Hainan Provincial Bureau of Quality and Technical Supervision, No.78 Binhai Avenue, Longhua District, Haikou City, Hainan Province, China. Hainan Provincial Bureau of Quality and Technical Supervision is a department directly under Hainan Provincial Government, which is mainly responsible for supervising and managing product quality and safety in Hainan Province, protecting consumers' rights and interests and promoting economic development.