How Fluorescence Affects Diamond Value in Today’s Market
When evaluating a diamond, most people focus on the traditional “4Cs” — cut, color, clarity, and carat weight. But there’s another factor that can influence both the appearance and the value of a diamond: fluorescence. Understanding what fluorescence is, how it impacts the way a diamond looks, and how the market responds to it can help buyers and sellers make informed decisions.
What Is Diamond Fluorescence?
Fluorescence refers to the visible light a diamond emits when exposed to ultraviolet (UV) light. About 25–30% of diamonds naturally exhibit some level of fluorescence, most often a soft blue glow. In rare cases, fluorescence can appear in colors like yellow, green, or orange, but blue is by far the most common.
Fluorescence is measured on a scale, typically