What does fluorescence in gemstones refer to?

Fluorescence in gemstones specifically refers to the emission of light when the gemstone is stimulated by ultraviolet radiation. This phenomenon occurs when certain minerals absorb UV light and then re-emit it as visible light, allowing these stones to exhibit a glow that can vary in intensity and color based on their chemical composition.

This property can be particularly important in gem identification and grading, as some gemstones exhibit distinctive fluorescence under UV light, which can help distinguish between natural and synthetic stones or even enhance their overall appeal. Although natural glow in daylight and absorption of light are characteristics exhibited by some gemstones, they do not accurately describe fluorescence. Additionally, fluorescence does not provide information about the age of a gemstone, making this an irrelevant association.