| 摘要 |
An arrangement for certifying and checking gem stones (12) and other valuables comprises an electron microscope (11) controlled by a computer (1) and arranged to acquire digitised electron micrographs of characteristic regions of the gem stone or other valuable, particularly the culet (13) or girdle (14) which are typically highly irregular and therefore highly characteristic of individual stones. The digitised electron micrographs are encrypted and written to an RFID (7) which can be embedded in a plastics certificate (10) of in some cases a concealed on the valuable itself. Any tampering with the gem stone (12) or other valuable can be detected by reading the stored micrographs in the tag (7) and comparing them with micrographs newly acquired from the gem stone (12) or valuable as presented for verification. For extra security, the digitised encrypted micrographs are also stored in a remote database which can also include transaction data and can be linked to a credit card database of a financial institution. |
