Xinhua International Plaza, Dayangfang Road, He Shili, Chaoyang District, Beijing. Xinhua International Plaza, Dayangfang Road, He Shili, Chaoyang District, Beijing has a market for buying opal, which is called Beijing Yihaitang Art Appraisal Co., Ltd. The company is located in Chaoyang, Beijing, and its main businesses are: antique recycling, porcelain calligraphy and painting, ancient coins, exquisite jade articles, gold products, educational consultation and recovering opal.