ISO 24016:2020

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ISO 24016:2020 is an international standard that sets out the methods, terminology, and classification for grading polished diamonds that are over 0.25 carats. It was published on September 18, 2020. 

This document specifies the terminology, classification and the methods that are used for the grading and description of single unmounted polished diamonds over 0,25 carat (ct). This document applies to natural, unmounted, polished diamonds.