Different Types of Diamond Fluorescence Colors

Diamonds fluoresce in every color of the rainbow. This effect in itself can make a diamond’s characteristic truly special and appealing in the eyes of collectors and regular consumers as well.

Since the strength of fluorescence can change the overall appearance of a stone, GIA has included the fluorescence aspect in a grading report. There are basically 5 different levels to differentiate diamonds with various degrees of this phenomenon. It can range from “none”, “faint”, “medium”, “strong” to “very strong”.

  • Did you know that the fluorescence entry on a grading report is a description and not a grade? In order to determine the degree of fluorescence, the gemologist subjects the diamond to longwave UV radiation.

    Paul Gian
    Founder - http://coloreddiamondguide.com
  • Diamonds that don’t glow will be classified as “None”. If the stone does, the gemologist will then proceed to describe the phenomenon.

    Here’s a GIA graded 0.29 fancy intense green yellow oval shaped diamond (report number: 51111269490). It glows in a delightful strong green fluorescence under UV lightings.

    Photography Credits: Tanojewelry

    fancy intense green yellow oval diamond        strong green fluorescence in diamond
    Blue is the more commonly found type of fluorescence in diamonds. In fancy colored diamonds, the tint of the glow would be influenced by the base color of the diamond.

    fancy yellowish green radiant cut diamond        colored diamond with strong blue fluorescence

    Diamonds Fluoresce In All Types of Colors 

    fluorescence of all colors

    And in the example here is an array of stones in a black box. The diamond on the far left is used as a control group diamond. It doesn’t have fluorescent properties and stays dark in black lighting.

    On the far right, the diamond shows a ghostly white colored glow in UV radiation. To its left, we have a strong yellow fluorescence that helps to complement the default yellow color of the diamond.

    What about orange colored fluorescence? Have you seen these types of fluorescence before? The 3rd and 4th diamonds from the left glowing in orange and pink are enough to make a grown man cry. Well, at least for a diamond collector.

    Having seen these examples, which of them is your favorite one and why? Feel free to leave a comment as we would definitely like to hear our reader’s thoughts on these. Next up, did you know that diamonds can fluoresce in multi-colors too?

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    1. Robert-Reply
      January 25, 2013 at 5:35 am

      Wow… my favorite one would be the orange glow. It’s so epic! For some reason, I didn’t like the white one as much.

    2. Julie-Reply
      November 11, 2014 at 7:09 pm

      I have a fancy yellow diamond that had orange florescence. Is this unusual?

    3. gelu arbanas-Reply
      June 12, 2015 at 2:02 pm

      the pink fluorescence is very nice. I have the same diamond purple pink 4.47ct with intense pink fluorescence.

    4. Theresa-Reply
      July 8, 2015 at 6:38 am

      I just got a little blacklight and happened to be playing around with it…. When I ran it over my wedding band, there was a bright orange(almost as bright as the picture) and 2 blue-green stones…. Now I wish they all glowed!!!

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