The working hours of Nanjing Jewelry Research and Testing Center are from 9: 00 am to 9: 00 pm 12 pm and from 6: 00 pm to 1 pm every Monday to Friday. Closed on Saturdays, Sundays and holidays.

Nanjing Jewelry Research and Testing Center Co., Ltd. was established on May 26th, 1994. The registered place is located in Taiping South Road, Qinhuai District, Nanjing, and the legal representative is Ruan. The company's business scope includes: jewelry and jade research, testing, teaching and training, technical consultation, watch testing, etc.