The black card certificate is a kind of certificate of Mozambique Diamond. It is called a black card because it is black. The black card is equivalent to the ID number of Mozambique Diamond. One diamond corresponds to one code. However, the black card certificate is not an internationally authoritative Mozambique diamond certificate, but a clearly counterfeit GIA certificate, which is widely recognized as a counterfeit certificate.
Difference between GRA certificate and GIA certificate
1. GIA is a non-profit organization funded by donations from professionals in the jewelry industry.
2. GIA's main service scope is education and research in jewelry appraisal and professional knowledge, which is highly recognized by the global jewelry industry; GRA studies moissanite, which is a type of jewelry in nature with a hardness second to diamond but a price only one tenth that of diamond.
3. GIA was founded by Robert M. Shipley in 1931, and was the pioneer in promoting diamond certification as international; GRA is currently an institution with nowhere to verify its authority.