atlas.media.mit.edu - Observatory of Economic complexity - Countries that export Diamonds (2012) atlas.media.mit.edu - Observatory of Economic complexity - Countries that export Diamonds (2015) [https://atlas.media.mit.edu/en/visualize/tree_map/hs92/export/show/all/7102/2016/ atlas.media.mit.edu - Observatory of Economic complexity - Countries that export Diamonds (2016)