Fluorescence, the effect ultraviolet (UV) light has on a diamond, is an important consideration when selecting a diamond. When UV light strikes a diamond with fluorescent properties, the stone emits a glow that is usually blue, but can also be shades of green, yellow, white, pink, orange, and red. The sources of fluorescence, boron and nitrogen, are the same mineral properties that lend to diamond color.
Fluorescence can occur in different intensities. Gemological laboratories rate the fluorescence of each diamond on a scale from "None" to "Very Strong". (Want to speak with a diamond expert? Call 866-737-0754 for expert advice on fluorescence.)
- None, Nil, Negligible
- No fluorescence, no influence on color.
- Faint, Slight
- Weak fluorescence, not a significant influence on color (barely perceptible).
- Average fluorescence, small influence.
- Strong, Extremely Strong
- Strong influence, substantial color influence.