• Le 21 mai 2020
    De 14:00 à 15:00

Emmanuel Fritsch, Professeur à l'Institut des Matériaux Jean Rouxel (IMN - Université de Nantes/CNRS) et responsable du DU de Gemmologie de l'Université de Nantes, a été invité par l'AIGS (Asian Institute of Gemological Sciences) à donner un webinaire grand public sur la luminescence des gemmes, en anglais, le jeudi 21 mai 2020 à 14h (heure de Paris).

Résumé de l'intervention (anglais) :

Luminescence is the somewhat magic emission of visible light under excitation. We will limit ourselves to what one can do with gems under a good UV light. Some gems use some of the UV energy to emit visible light. There are several necessary steps to correctly observe and evaluate the luminescence of a gem in terms of color, intensity, homogeneity, turbidity. Luminescence constitutes a unique aspect of the hidden identity of a gem. It might even last after the light is turned off, that is phosphorescence.

We will explore some fun luminescent gems, and demonstrate how the so-called phosphorescence can be truly useful for some gem identification. Also, it can be used in enhanced jewelry.

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