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| T/CAQI 222-2021 Hetian Yu (Bi Yu) bangle grading (English Version) |
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Detail of T/CAQI 222-2021
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Introduction of T/CAQI 222-2021
本文件规定了和田玉(碧玉)手镯分级的颜色分级、质地分级、净度分级、加工工艺质量分级、质量、组合级别表示方法、分级要求和分级证书。
本文件适用于和田玉(碧玉)内圈为圆形的手镯产品分级，其他形状的手镯可参照执行。
Contents of T/CAQI 222-2021