Fancy Cut is any cut other than a round brilliant or single cut. Fancy Cut Diamonds is a diamond cut something other than a round, such as baguette, emerald, triangle, pear, star, marquise, and oval, etc. The term is usually applied to melee. Filigree is an ornamental work formed of wire, bent into designs, sometimes with bits of metal added, soldered together and to other parts of the piece of work. Fire is colored light reflected from within a diamond.
Fire is maximized by a diamond to the correct proportions.
Fluorescence is a glow, usually of a bluish color, which emanates from certain diamonds when exposed to ultraviolet light. Strong fluorescence should avoided but faint fluorescence usually does not affect the appearance of a diamond. Girdle is the narrow band around the width of a diamond. The setting usually holds the diamond around the girdle. Hardness is the resistance to scratching, abrasion, and indentation.