Method for computing a unique identifier for a gemstone having facets

摘要

The invention relates to method for computing a unique identifier for a gemstone, comprising: - acquiring a 2D digital master image (MI, MIn, MIw) of the gemstone, where an image of a reference mark (56) on the gemstone defines a master image referential (OR, XR, YR); - matching a virtual selection mask with the master image according to a predefined position and orientation with respect to the master image referential; - defining, in the master image, a plurality of distinct selected zones (SZ') corresponding to the location of selection zones of the matched mask; - detecting, in each of the plurality of distinct selected zones, the presence or not of at least one facet edge portion image; - defining a location of the detected facet edge portion images in the master image; - computing a unique identifier based on the defined locations of the detected facet edge portion images.