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ISO 24016:2020
M00002160
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ISO 24016:2020 Jewellery and precious metals - Grading polished diamonds - Terminology, classification and test methods
standard by International Organization for Standardization, 09/01/2020
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ISO 24016:2020 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. It is not to be used for fancy coloured diamonds, synthetic diamonds, treated diamonds (other than is allowed for in 7.4), nor for assembled stones.