Business. Changle Gem City is located in the north of Changle County, and its business hours are from 9: 00 am to 16: 30 pm, and it is still open during the Spring Festival. Changle Gemstone City was built in 1993, covering an area of 120 mu, with a construction area of 80,000 square meters. It is the largest and most complete wholesale market for precious stones, gold and silver ornaments and handicrafts in China approved by the State Administration for Industry and Commerce.