Natural flaws in diamonds are called inclusions and blemishes.
Interior inclusions might be tiny gas/air bubbles, solid deposits, clouds of tiny clear crystals, or cracks which are called feathers.
Ice cubes in water are good comparisons
External blemishes can range from chips, poor cuttings, scratches or pits on the diamond's surface.
Some diamond inclusions can be seen only by microscopic inspection or 10x loupe. Others are visible to the naked eye.
The more noticeable the inclusion, the poorer the grade.
Inclusions tend to do several things:
- Interrupt paths of light
- Detract the eye from the beauty of a diamond
- Jeopardize the integrity of the diamond
| Comparing Color Grades | ||
|---|---|---|
| GIA | AGS | Description |
| D | 0 | Colorless |
| E | .5 | |
| F | 1 | |
| G | 1.5 | Near Colorless |
| H | 2 | |
| I | 2.5 | |
| J | 3 | |
| K | 3.5 | Faint Yellow |
| L | 4 | |
| M | 4.5 | |
| N | 5 | Very Light Yellow |
| O | 5.5 | |
| P | 6 | |
| Q | 6.5 | |
| R | 7 | |
| S | 7.5 | Yellow |
| T | 8 | |
| U | 8.5 | |
| V | 9 | |
| W | 9.5 | |
| XYZ | 10 | |
Notes:
-Rendering more subtle shades of color is difficult because of the 255 color limitation for browsers.
-The comparisons above are presented merely as indications.