This handbook is a breakthrough in the understanding of the large number of spectral lines in diamond. Data on more than 2000 lines and bands are presented in 200 tables, including many unpublished results.With a novel organization scheme, the search for a specific line is greatly simplified as a benefit for researchers and students.In order to meet the interest in the understanding of the spectra, structure assignments for 80 % of the lines are given, of which 15 % only we...