The six CIBJO Blue Books are definitive sets of grading standards and nomenclature for diamonds, coloured gemstones, pearls, coral, precious metals, and gemmological laboratories. They are compiled and then are consistently reviewed and updated by the relevant CIBJO Commissions, whose members include representatives of trade organisations and laboratories active in the respective areas of the industry. In the almost complete absence of jewellery industry standards endorsed by the International Standards Organisation (ISO), the CIBJO Blue Books are the most widely accepted set of globally accepted standards.
The updated versions can be downloaded from the following page on the CIBJO website: http://www.cibjo.org/introduction-to-the-blue-books/.
For individuals who are not members of a CIBJO-member organisation, each individual download will cost 9.90 Swiss francs. All six Blue Books (Diamond Book, Gemstone Book, Pearl Book, Coral Book, Precious Metals Book and Gemmological Laboratories Book) can be downloaded as a single package at a discounted rate of 49.90 Swiss francs. For individuals who are members of an organisation that belongs to CIBJO, he or she is entitled to receive the CIBJO Blue Books free of charge. They should contact the organisation of which they are members to arrange delivery of the relevant Blue Books by email.
(excerpts from a FEBRUARY 13, 2016 CIBJO press release – the underlining is ours)