The 4 C's is a commonly used description for all parameters that determine the value of a diamond. The 4C's gather the weight (Carat), Color, Clarity and the Cut. The evaluation of these parameters is done by grading labs all over the world.

Antwerp, the city of the world most famous diamond cutters. For centuries Antwerp is the world center for diamonds. If you want your rough being processed to meet the highest standard, take a look here.

A list of downloadable WTOCD articles is available, besides references to articles of WTOCD published by third parties.

We provide a link page, sorted per business activity, with links to a lot of professional organisations.