Quanyechang jewelry processing center. Tianjin Quanyechang Jewelry Processing Center, which can weld platinum rings, was established on 2019-10/6 and registered in Nanjing Road, Quanyechang Street, Heping District, Tianjin. As long as it is engaged in the processing and maintenance of gold and silver jewelry, platinum rings can be welded accurately. Tianjin, also known as Jingu and Jinmen, is a provincial administrative region of People's Republic of China (PRC).