NOVA, Season 43, Episode 18, Treasures of the Earth - Gems
directed by Doug Hamilton, fl. 2000-2012; produced by Lin Sun, fl. 2016, Lin Zhang, fl. 2014 and Doug Hamilton, fl. 2000-2012, WGBH Educational Foundation and NOVA, in NOVA, Season 43, Episode 18 (Arlington, VA: Public Broadcasting Service, 2016), 53 mins