All laboratories must have DIAMOND on the report or certificate.
DIAMOND is used exclusively for diamonds of natural origin. In layman’s terms, if your diamond certificate or report does not state clearly DIAMOND IE: NATURAL DIAMOND on the certificate then is not compliant or working to Cibjo or IDC rules adopted by the ISO. This means the laboratory has not tested or proven the stone to be of natural origin.
MILAN, ITALY: JULY 27, 2015 - CIBJO has welcomed the publication of ISO International Standard 18323, entitled "Jewellery - Consumer confidence in the diamond industry," which specifies a set of permitted descriptors for the diamond industry that are designed to be understood by consumers. The new ruling by the International Standards Organisation explicitly defines a diamond as having been "created by nature" and further notes that "the denomination 'diamond' without further specification always implies 'natural diamond.'"
The new ISO International Standard mirrors the definitions outlined in CIBJO's Diamond Blue Book, which are aligned with those of the International Diamond Council (IDC). The Diamond Blue Book, the IDC Rules, and also the PAS 1048 documents, relating to terminology and classification of grading polished diamonds that were developed by CIBJO with the support of the German Standards Institute (DIN), were cited as the primary sources in the ISO International Standard's bibliography.
See: how to read a DCLA certificate. DCLA diamond grading reports are only issued for natural untreated and unenhanced diamonds. Therefore every diamond report issued by the DCLA has the term NATURAL DIAMOND clearly noted at the top of the certificate.