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Those diamonds that produce a visible reaction when exposed to ultraviolet radiation. In laboratory experiments with both trained gemologists and individuals with no diamond experience (meant to represent the jewellery-buying public), no relationship was found between fluorescence and a diamond's overall appearance. Diamonds with a strong or very strong fluorescence are a better value for the end customer because the market prices them slightly lower than diamonds with faint or negligible fluorescence.
For more information, read our education on Fluorescence.
See also: Diamond Colour, Diamond Grading, Diamond Education.
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