If the culet is medium to large, when the diamond is viewed from the table, it will look like there is a hole in the bottom of the stone. A diamond with no inclusions visible to the naked eye without the loop. The flat polished surfaces on a diamond. A round brilliant diamond has 58 facets. Colored light reflected from within a diamond.
Fire is maximized by cutting a diamond to the ideal proportions.
Fluorescence A glow, usually of a bluish color, which emanates from certain diamonds when exposed to ultraviolet light. Strong fluorescence should be avoided, but faint fluorescence usually does not affect the appearance of a diamond. The narrow band around the width of a diamond. The setting usually holds the diamond around the girdle. A flaw within a diamond, such as a spot or irregularity in the crystal structure of the stone.