Jewellery and precious metals. Grading polished diamonds. Terminology, classification and test methods not-for-sale It helps by setting out

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Jewellery and precious metals. Grading polished diamonds. Terminology, classification and test methods not-for-sale It helps by setting out1 Scope 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. 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.