From November 26th to 29th, 2019, the 4th International Carbon Materials Conference and Industry Exhibition 5G Era Diamond Innovation Application Forum was successfully held at the Shanghai Convention and Exhibition Center for International Sourcing. The four-day forum is rich in format. Aimed at the diamond industry chain, there are 5,000 square meters of booths, wonderful forum reports, Workshop series activities, demand matching and CEO summit forums. Well-known industry experts and business representatives collided with the sparks of wisdom to discuss new technologies, new breakthroughs, new developments and new opportunities in the diamond industry from multiple fields and perspectives.