Rupee Cut LuAG Gems, Ultrabright Green Lumogarnet Scintillators

These are hyperfluorescent green LuAG cut in long hexagon "rupee" cuts!  These are sold by carat size or range--exact size and proportions vary.

LuAG is an exotic lab-created garnet, with a composition and properties which are impossible in nature--in particular its outrageously strong green fluorescence which makes it glow when exposed to almost any light.   It was designed and grown for use in PET scanners and other radiation-detecting devices but happens to make an incredible gemstone!