The worth of a piece of diamond directly relates to its quality. Two natural diamonds with slight differences in quality could result in significant discrepancies in value.

Diamonds are classified into grades that are indistinguishable by the naked eye. Following Antwerp's professionalism and sales models, Belgium Diamond House makes use of a series of professional authentication apparatus to provide customers with expert diamond analyses. These apparatus include the "Diamond Proportion Comparator" exclusively used by an authoritative gemological organization (GIA), the world’s most advanced colorimeter and the "10x" magnifying loupe, and "30x" and "120x" gemology of international standard.