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HRD Diamond Certificates are the authoritative diamond quality reports from the Hoge Raad voor Diamant (Diamond High Council) of Antwerp, Belgium, the official representatives of the influential Belgian diamond industry. The HRD Certificates Department uses a diamond grading system that differs in many details from those commonly used in the United States and elsewhere, but provides ample numerical information for our formulas. We evaluate the data entries according to their GIA equivalents as defined at the HRD website. The HRD "appreciation comments", such as "good" or "unusual" are used for identification purposes only. |