1. Jiangsu Gold and Jewelry Testing Center is located in Longpan Middle Road, Liuhe District, Nanjing City, Jiangsu Province. Its main business is precious metal detection and precious stones detection, so all gold and adzuki beans can be sent here for identification.

2. Liuhe District, located in the north of Nanjing, is an important modern industrial base of the country, an advanced manufacturing cluster and a scientific and technological innovation base in the east of the country, an important modern service center in the Yangtze River Delta region, and together with Pukou District, constitutes Nanjing Jiangbei New District.