Fluorescence

Fluorescence in gemstones refers to the visible light some emit when exposed to ultraviolet (UV) light.

Part of speech: noun
Definition: Fluorescence is a luminescent property observed in some gemstones, which leads them to emit visible light when they are exposed to ultraviolet (UV) light or similar energy sources. This phenomenon varies from gem to gem, with certain stones displaying strong fluorescence, while others show none at all. The presence or absence of fluorescence can significantly affect the appearance of a gemstone under different lighting conditions, making it an important factor in the assessment and valuation of diamonds and other precious stones. For example, diamonds with strong fluorescence may appear whiter or more glowing under UV light, which might be seen as desirable by some and less so by others, hence impacting their market value.