Have you ever noticed the term “Fluorescence” when shopping for a diamond? Did you know that some diamonds show effects under ultraviolet light?

For most people who purchase diamonds, fluorescence will be a non-issue, but some might be confused by the term. Diamond fluorescence is a characteristic in which a diamond displays a glow (usually blue) when exposed to ultraviolet light. More rarely, they emit a yellow or orangy light. According to the GIA, about 25% to 35% of diamonds exhibit some degree of fluorescence.

Source: GIA.edu

Our expert Blake, General Manager Michaels Jewelers Trumbull, shared the effects of diamond fluorescence and what to look for when selecting a diamond.

1. Strong fluorescence can make a diamond look hazy/milky and oily with less transparency in natural light. It may appear like a film on the stone, almost as though there are really bad finger prints you can’t wipe off

2. Slight fluorescence can actually improve the appearance of color in a diamond to make it look naturally whiter - This may save a little bit on the cost of the stone. However, to ensure the best reflection, refraction and dispersion, and to maximize these aspects of a diamond with superior cuts, you ideally don’t want any fluorescence conflicting with that

3. Overall, fluorescence is neither good nor bad. A diamond’s beauty is in the eye of the beholder

Leave us a comment below with any additional questions related to diamond fluorescence and what you'd like to see next in our Pro Tips series!