I would hazard a guess the photographer got creative with a UV flashlight given the eerie blue glow on the stone that is not florescent https://www.minershop.c

I would hazard a guess the photographer got creative with a UV flashlight given the eerie blue glow on the stone that is not florescent https://www.minershop.com/pages/uvandourhobby https://www.minershop.com/pages/uvandourhobby