Has anyone seen tanzanite fluoresce bright Orange red? Trying to identify a stone previously sold as a Tanzanite but I couldn’t get a RI reading in it.
Tanzanite rarely sees orange-red fluorescence.
You have to be careful, it may be synthetic blue spinel (cobalt), which will also show red fluorescence under short-wave ultraviolet.
It is recommended to confirm the refractive index of the gemstone first before making a diagnosis.