With a booming trade in the diamond industry, masters hailed from all parts of Europe to learn the fine art of polishing in Antwerp. It soon became clear to the diamond processors that there had to be a quality control in order to guarantee its high standard of diamond polishing.
This decree successfully implemented in 1585, dictated that everyone who polishes diamonds had to swear and promise to abide by all rules of the flourishing diamond trade:
"I hereby swear from now on I shall be faithful and obedient to the Superintendents and Seniro members of the Guild I shall respect the privileges Ordinances."
Thus, consumer confidence was already a top priority in the 16th century in Antwerp.