| Term |
Diamond Glossary by rab for Paul Van den Eynde |
| Facet |
Plane, polished surface of a diamond. |
| Faceted Girdle |
Sometimes cutters polish the girdle into 32 facets.
|
| Fancy Diamond |
A diamond with an attractive natural body color other than light yellow or light brown. |
| Feather |
A separation or break due to either cleavage or fracture, often white and feathery in appearance. |
| Flaw |
An imperfection of a diamond. |
| Fluorescence | Mostly blueish glow of a Diamond in high ultraviolet lighting conditions. Ratings: none, faint, slight, medium, strong blue. Strong blue fluorescence may cause the diamond to appear oily in daylight. |
| Fracture |
A crack on the diamond's surface. |
