The city has gathered gem products from Thailand, Sri Lanka, South Africa, India, Australia and other major gem producing countries in the world, as well as major gem and jewelry processing and wholesale enterprises in Changle, as well as operators and manufacturers of crystals, jades, pearls, gold foil handicrafts, jade carvings, antiques, stone carvings and calligraphy and painting all over the country. Changle Testing Room of Shandong Gold, Jewelry and Jade Product Quality Supervision and Inspection Center is located in China Gem City, providing customers with perfect and reliable product quality testing services. Rich products and perfect services attract domestic and foreign jewelry merchants and tourists to visit and trade, and the annual transaction volume exceeds one billion yuan, making it a veritable "investment and shopping paradise".