What''s the difference between "slight" and "faint" fluorescence?

[orange_horse]

Just wondering...

 

[windowshopper]

barely see it and barely see it a bit more--means nothing

 

[JohnQuixote]

Almost no difference. Medium or less is rarely observable in most lighting conditions. Under black light (UV) a stone with fluorescence will glow. A lot of people don't mind, or like, or in some cases seek out fluorescence.

Levels:

Inert/No Fluorescence +
Faint/Slight Fluorescence +
Medium Fluorescence
Strong Fluorescence *
Very Strong or Extreme Fluorescence *

+ In January of 2003 AGS changed their grading of inert and faint fluorescence to "negligible."

* Strong or very strong fluor can have a visible effect. In some cases this can cause a milky or cloudy appearance, which is to be avoided (happens rarely). On the other hand, strong fluorescence can help a diamond of lower color appear closer to colorless.

(this all pertains to blue fluorescence by the way)

Edited to reflect AGS 2003.