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Blue corundum fluorescence?

Hi everyone,

I have just seen an odd specimen of sapphire and need some advice.
blue Red

Blue in daylight and red under UV. Help?


That is a dramatic change and a beautiful red color. I have seen natural sapphire with red fluorescence under LW uv light. SW uv light might fluoresce yellowish green. Chalky blue or yellowish green could indicate heat treatment. But the red is natural.