LITERATURE
  1. GIA Diamond Grading. Vol. 1,2. GIA
  2. M. Van Bockstael. Diamond grading and identification. Vol 1,2. Diamond High Council, Institute of Gemology, Belgium.
  3. Pagel-Theisen V. Diamond Grading ABC (Handbook for Diamond Grading), 11th edition, 1993, Antwerpen, Belgium
  4. Rapaport Diamond Report (monthly)
  5. International Standard ISO CD 11211