Emeralds will show red fluorescence due to chromium according to their localities, and they will show no fluorescence (inert) if they contain impurity elements such as iron. When resin is filled stones may fluoresce in blueish white to faint blueish white colour. Emerald filled with oil sometimes show bright yellow-green fluorescence. Depends on the type of filling material, however, many stones do not show any fluorescence, and only characteristic fluorescence if observed can be a help of identification.

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