Ghost Garnet aka Pr:LuAG Lumogarnet Faceted Loose Gems Orange Glow

These are faceted 'Ghost Garnet', aka lab made Pr-doped LuAG (Lutetium Aluminum Garnet). We have calibrated rounds both in high dopant and lower dopant levels--both are gorgeous.

LuAG is an exotic lab-created crystal with the same structure as natural garnets, but a composition and properties which are impossible in nature.  While the most famous type is the neon green cerium-doped LuAG, when doped with praseodymium instead you get this very odd multifluorescence: longwave UV gives a pale green, shortwave gives violet and best of all blue light gives a strong orange glow.  This means that against a black background in blue-leaning lighting you have a light green stone with a visible orange glow--very uncanny!

Pr:LuAG, like its more famous brother Ce:LuAG, is used as a scintillator in high end applications.