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

CIBJO Diamond Commission Special Report (synthetics and inclusion mapping technologies)


CIBJO released a Diamond Commission Special Report (SEPTEMBER 7, 2016). The report (cibjo-special-report-2016-diamond-commission) discusses two important developments: Synthetic diamonds. The report reiterates standards introduced by CIBJO to clearly distinguish between natural and man-made gems. These essentially were adopted (in general) by the International Standards Organisation in 2015, when it released ISO International Standard 18323 (specifies a set of … Continue reading CIBJO Diamond Commission Special Report (synthetics and inclusion mapping technologies)