Fluorescence
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Definition
The visible light emitted by a gemstone when it is exposed to ultraviolet (UV) radiation, which ceases as soon as the UV source is removed.
Detailed Explanation
宝石が紫外線(UV)照射を受けたときに可視光を発する現象で、UV線源を取り除くと直ちに消失します。ダイヤモンドの約30%が青色蛍光を示し、品質評価の要素となっています。