Monday to Saturday from 8: 00 to 12: 00 and 14: 00 to 17: 30. Jilin Gold, Silver and Gem Jewelry Quality Supervision and Inspection Center is a department under Changchun Institute of Metrology, Verification and Testing Technology, located at No.928 Silicon Valley Street, Chaoyang District, Changchun City, Jilin Province. According to the query of metering network, the working hours are from 8: 00 to 12: 00, 14: 00 to 17: 30 from Monday to Saturday, and it is closed on Sundays and holidays.