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Facet
These are the polished surfaces of a diamond. The way that light moves through a diamond and interacts with the facets give a diamond its fire and sparkle.

Fancies
Fancies are attractively coloured diamonds. Diamonds can be coloured red, emerald green, sapphire blue, pink, black, orange or brown.

Fancy Shapes
A diamond whose shape is anything but round, i.e., heart, pear or oval.

Feather
A feather is a type of inclusion or flaw within a diamond. It is often white and feathery in appearance.

Fire
When white light enters a diamond, it is dispersed and refracted into a spectrum of colours that can be seen by the naked eye. The term fire refers to the intensity of this dispersion of light.

Fluorescence
Fluorescence is a form of lumination that is created when a diamond is exposed to low or high wave ultraviolet radiation. Faint fluorescence will rarely detract from a diamond's beauty and cannot normally be seen or separated by the naked eye. Strong fluorescence can sometimes improve the appearance of diamonds that possess colour.

Fracture
A crack on the surface of a diamond