国检证书有几种?国检证书要看其权威程度只要认准三个标志:cma、cal、cnal。如何看国检钻石鉴定证书?还有国检证书的内容:国检证书一般是在钻石镶嵌之后出具的,所以证书上标示出的是整件首饰的总质量,最后是证书的查询。
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