If you were to place a diamond tennis bracelet under an ultraviolet light, many of the diamonds would probably have a noticeable blue glow and some would probably show hardly any glow or none. This is because diamonds are often fluorescent, which means they omit light when stimulated by UV lights or sunlight. Normally the fluorescence is blue but occasionally it's yellow, white or orange. The Hope Diamond has a distinctive red fluorescence. There's a lot of misinformation about diamond fluoresce...
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