None (some fracture-filling materials used to improve emerald's clarity do fluoresce, but the stone itself does not)
References
[1]
Main emerald producing countries
Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium or sometimes vanadium.[2] Beryl has a hardness of 7.5–8 on the Mohs scale.[2] Most emeralds have much material trapped inside during the gem's formation,[3] so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.
^Cite error: The named reference Mindat was invoked but never defined (see the help page).
^ abHurlbut, Cornelius S. Jr., and Kammerling, Robert C. (1991). Gemology, John Wiley & Sons, New York, p. 203, ISBN 0-471-52667-3.
^"Emerald Quality Factors". Gemological Institute of America. Archived from the original on 2 November 2016. Retrieved 1 November 2016.
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