Updated editions of all Blue Books of gemmological standards and nomenclature on CIBJO website


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 … Continue reading Updated editions of all Blue Books of gemmological standards and nomenclature on CIBJO website