Yu Zi's official residence in Zhonghai, Yanji Road, Shibei District, Qingdao, Shandong Province. Baidu map information shows that Shandong Jewelry and Jade Detection Station of China Metallurgical Geology Bureau is located in Guandi, Zhonghai Yu Zi, Yanji Road, Shibei District, Qingdao, Shandong Province. Is a professional jewelry and jade appraisal institution, whose main business scope includes the appraisal of jewelry and jade products such as diamonds, emeralds and gold.