Fluorescence in Diamonds

Fluorescence in Diamonds: Unveiling the Hidden Glow

Diamonds have long been cherished for their unmatched brilliance and beauty, but there's an intriguing aspect that often goes unnoticed: fluorescence. This phenomenon, present in a significant number of diamonds, adds a unique layer to their allure and value.

What is Fluorescence in Diamonds?

Fluorescence in diamonds refers to the glow that some diamonds exhibit when exposed to ultraviolet (UV) light. This effect is caused by certain substances within the diamond, such as boron or nitrogen, which absorb UV light and emit a visible light, often blue or yellow.

How Common is Fluorescence in Diamonds?

It's estimated that about a third of all diamonds show some degree of fluorescence. However, the intensity varies significantly, with descriptors ranging from 'None' to 'Very Strong' on gemological certificates.

Impact on Appearance and Value

The impact of fluorescence on a diamond's appearance can be nuanced. In some cases, particularly in lower colour grade diamonds (I-M color grades), strong blue fluorescence can make the diamond appear whiter or more colourless in UV-rich environments, like sunlight. However, in very rare cases, strong fluorescence can give the diamond a milky or oily appearance, which will reduce its appeal and value. This is not something you can ascertain from the diamond certificate, only by viewing it with the naked eye. While modern research has shown that such a few highly fluorescent diamonds display negative visual characteristics, the industry still regards fluorescent diamonds as less desirable, and hence they will retail at a discounted rate when compared to non-fluorescent diamonds. 

Fluorescence and Diamond Grading

When diamonds are graded, fluorescence is one of the factors considered. Gemological laboratories such as the Gemological Institute of America (GIA) include fluorescence ratings on their reports. While it's a secondary characteristic compared to the four Cs (Cut, Colour, Clarity, and Carat Weight), fluorescence can still influence a diamond's overall appeal and market value. At Daniel Christopher, we only sell diamonds with minimal fluorescence (Nil or Faint) which isn't visible to the naked eye.

Choosing a Fluorescent Diamond

The choice of a fluorescent diamond is largely a matter of personal preference. Some people are drawn to the unique character it can impart, while others prefer a diamond without this trait. In terms of investment, diamonds with no or faint fluorescence are generally more highly valued in the market, but those with medium to strong fluorescence can offer a more budget-friendly option without compromising on beauty. While we are happy to source you a diamond with fluorescence, our recommendation will be to select a stone with Nil or Faint fluorescence, as these will not have any negative visual impact, nor reduce its intrinsic or future resale value.

Conclusion

Fluorescence in diamonds is a fascinating feature that adds complexity to the already intricate world of diamond evaluation. Whether it enhances or detracts from a diamond's beauty is subjective, but its presence certainly makes for an interesting talking point and adds another layer to the story of each individual gemstone.