The Diamond Pro

IGI vs. GIA Fluorescence

The following is a real email conversation between The Diamond Pro and a reader just like you who contacted us. Personal information is always removed. Learn from these posts, or contact us yourself to get free personalized help.

If IGI grades slight flourescence [sic] in a diamond of G color. Is it actually going to be medium or even strong by GIA criteria? How does slight floures affect the price of a diamond.

It’s very possible that an IGI “slight” fluorescence diamond would be graded “medium” by the GIA.  I would put the odds as follows for how the GIA would grade it: slight 25%, medium 60%, and strong 15%.  Slight fluorescence usually has no effect on the price of a diamond.

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