Lafayette , 47901

The intensity of fluorescence is described by the GIA as follows: None [NN]; Faint [FT]; Medium [MED]; Strong [STB]; and Very Strong [VSB].
Faint and medium fluorescence are typically not detectable to the naked eye and may be viewed simply as a characteristic of any diamond.
Faint fluorescence does not influence value while medium fluorescence in colors H and higher should be discounted a couple of percent; however, when considering 'I' color or lower, faint or medium blue fluorescence actually enhances the color and makes these diamonds a few percentage points more valuable than equivalent colors without fluorescence.
"Strong" and "Very Strong" blue fluorescence can often be detected with the naked eye and can cause a diamond to appear less brilliant and even milky. As a general rule these stones should be avoided.
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