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Is the diamond appraisal certificate of the diamond ring bought by Taiwan Province Xinjin Diamond Jewelry Co., Ltd. true or false?
Domestic certificates suggest you take a look at this. p/287 12 19862。

Foreign certificates are generally: the following three are more.

Gemological Institute of America (GIA) ——GIA Diamond Grade Certificate

International Gemological Institute (IGI) ——IGI Diamond Grade Certificate

Belgian Diamond High Council -HRD Diamond Grade Certificate

Your certificate may be from Taiwan Province province.

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