Gem Nation -- Glossary of Diamond, Jewelry and Watch Terminology | ||
Facet A polished surface on a diamond. |
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Fire Fire is the amount of colored light reflected from within a diamond. White light entering a stone is separated into the many colors of the rainbow just like a prism. Good fire can only be achieved with very good to excellent proportions. Also called "refraction" or most often "dispersion" in the trade. |
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Fluorescence A glow 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. In fact, faint or moderate blue flourescence is preferred by some customers because it can make a less expensive yellowish color appear more white or colorless in daylight. |
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Fractures Fractures are caused mainly by mechanical stresses like pressure or impact and may run in all directions within the diamond. |
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