GAGG Lumogarnet Facet Rough Neon Yellow (Day Glow Fluorescence, Slight Phosphorescence)

These are lab-created GAGG (Gadolinium Aluminum Gallium Garnet) crystal facet rough. Each piece is marked with its letter and weight and you select which one to purchase.

Cerium GAGG is a brand new crystal as far as gems go--it only entered industrial usage in 2014, and we just introduced it to the gem market last year. It is what we call a 'lumogarnet' - an exotic lab-created garnet with incredible fluorescence.

Like Ce:YAG and LuAG GAGG is used as a scintillator, a crystal grown for its insanely strong fluorescence.  It is used to help detect invisible radiation by absorbing it and converting it to easily-detected visible light--gamma rays and x-rays will activate its glow in addition to UV and even normal blue light.

Properties-wise this material is like an upgraded version of the classic GGG crossed with an aluminum garnet (like YAG and LuAG) to give it excellent hardness (8) while maintaining a high RI (1.9) and generally excellent gem properties. This material has very bright fluorescence, and like Ce:YAG and LuAG it is used as a scintillator to help detect invisible radiation.

These stones also have some phosphorescence! How much and how long it glows varies, and these stones have a weaker afterglow (aka 'quick phosphoresence'), not super bright or long lasting but still very cool and noticeable in a dark room.

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