Lab Grown Diamond fluorescence is not one of the 4C diamond quality criteria (color, clarity, cut and carat weight) that describe diamond quality.
GIA considers fluorescence an identifying characteristic and additional information that helps differentiate between diamonds. The GIA diamond grading report describes fluorescence intensity as None, Faint, Medium, Strong and Very Strong. If the fluorescence intensity is medium, strong, or very strong, the color of the fluorescence will be noted in the identification report.
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