Group | | Description |
| A | | inserts that have defects of natural or artificial origin in the form of single cracks, stripes, point inclusions in separate zones, slightly visible at 10-fold magnification, gloss and «game» are maximum;
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| B | | inserts that have defects of natural or artificial origin in the form of cracks, stripes, spot inclusions, veils, barely visible to the naked eye through the column, but easily distinguishable at 10-fold magnification, located in separate zones that do not reduce the Shine and «game»; |
| C | | inserts that have defects of natural or artificial origin in the form of cracks, stripes, point inclusions, veils located throughout the volume, easily discernible to the naked eye, partially reducing the Shine and «game»; |
| D | | inserts that have large and numerous defects of natural or artificial origin in the form of veils in separate zones, cracks, stripes, point inclusions, shells located throughout the volume, easily discernible to the naked eye, significantly reducing the gloss and «game»; |
| E | | inserts completely filled with effects of natural or artificial origin in the form of a network of cracks, stripes, inclusions, shells, with sections of the veil in various zones, absolutely reducing the gloss and «game». Determining the quality group is performed by viewing the jewelry stone through a 10-fold magnifying glass, as well as with the naked eye. |