Reliable. Nanyang Zhongzhi Jewelry Testing Co., Ltd., established on 20 17, is located in Nanyang City, Henan Province. This company is a formal company protected by official website's certification law, so it is very reliable. Nanyang Zhongzhi Jewelry Testing Co., Ltd. is an enterprise mainly engaged in professional technical services, and its business scope is: jewelry and jade appraisal; Gold, silver and jewelry inspection service.