Topic summary
CIBJO
Extracted from the Wikipedia article World Jewellery Confederation.
CIBJO Blue Book
CIBJO Blue Books define grading standards and nomenclature for diamonds, coloured gemstones, pearls, precious metals, and gemmological laboratories. The standards are studied, compiled, and updated by member-representatives. CIBJO claims that they are the most widely accepted set of globally accepted standards. They are subject to annual review.