What’s  Diamond Fluorescence?

Diamond fluorescence refers to the phenomenon where a diamond emits a soft glow when exposed to ultraviolet (UV) light sources. This glow is typically blue, but can also appear yellow or green in some diamonds. Fluorescence occurs due to the presence of trace elements, usually nitrogen, within the diamond’s crystal structure. When these elements absorb UV light, they emit energy in the form of visible light, causing the diamond to fluoresce. While fluorescence is a natural characteristic of some diamonds, its intensity can vary greatly, ranging from none to very strong. This unique property adds an intriguing dimension to a diamond’s appearance and is one of the many factors that gemologists consider when evaluating its quality and value.

The effect of fluorescence on a diamond’s appearance can vary. In some cases, fluorescence can enhance a diamond’s perceived color grade, making it appear whiter, particularly in diamonds with lower color grades (J and below). However, in rare instances, strong fluorescence may cause a diamond to appear hazy or milky under certain lighting conditions, detracting from its brilliance.

Diamond fluorescence is graded on a scale from None to Very Strong by gemological laboratories like the Gemological Institute of America (GIA). Diamonds with fluorescence graded None or Faint typically have minimal to no fluorescence and are unlikely to exhibit any noticeable effects on their appearance. Diamonds with fluorescence graded Medium to Very Strong may exhibit varying degrees of fluorescence, with potential effects on color perception and brilliance.

Ultimately, the significance of fluorescence in a diamond comes down to personal preference. Some individuals appreciate the unique glow that fluorescence imparts, while others may prefer diamonds without any fluorescence to ensure consistent appearance under all lighting conditions.

Diamond fluorescence, while often a fascinating characteristic, can impact a diamond’s price in various ways. Generally, diamonds with strong fluorescence tend to be less expensive than those with no fluorescence or faint fluorescence. This is because strong fluorescence can sometimes cause a diamond to appear slightly hazy or milky, particularly in natural daylight or fluorescent lighting conditions, affecting its perceived clarity and color. However, diamonds with medium or faint fluorescence may actually appear whiter in certain lighting environments, making them more desirable and potentially commanding a higher price. Ultimately, the impact of fluorescence on a diamond’s price depends on factors such as the intensity of fluorescence, the diamond’s overall quality, and individual preferences of buyers.