Fluorescence

What Is Diamond Fluorescence?

Fluorescence is a naturally occurring phenomenon in certain minerals and gems, including some quality diamonds. When exposed to ultraviolet (UV) light, these diamonds emit a visible light known as fluorescence. While this fluorescence is typically not visible under most lighting conditions, a diamond will exhibit a soft colored glow when held under a UV lamp.

Do All Diamonds Fluoresce?

Not all diamonds exhibit fluorescence. If a diamond does not fluoresce, its grading report will note the fluorescence level as either inert or none.

Types of Diamond Fluorescence

The degree of fluorescence in diamonds can vary, and it is typically categorized as follows:

Faint: The diamond exhibits a slight glow that is difficult to see under UV light.
Medium: The diamond shows a noƟceable glow under UV light.
Strong: The diamond emits a clear glow under UV light.
Very Strong: The diamond displays a deep and prominent glow under UV light.

The color of the fluorescence can also vary, with blue being the most common. However, some diamonds may fluoresce in yellow, green, or white.

How Does Fluorescence Affect A Diamond?

In regular lighting conditions, fluorescence usually has no significant effect on a diamond's appearance. However, in certain cases, strong blue fluorescence can make a yellow-tinted diamond appear whiter. In rare instances, strong fluorescence can cause a diamond to appear milky or oily.

Understanding the role of fluorescence can help you make an informed decision when selecting a diamond, ensuring you choose a stone that meets your preferences and maintains its beauty under various lighting conditions.