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scintillator-grade cerium YAG look dim
dual-doped neodymium+chromium YAG
These are faceted hologram crystals
While virtually all GAGG has at least a little afterglow
57 and extreme dispersion of 0
Sapphire D20 53ct, 1980s Infrared Countermeasures Sapphire T-shirts scintillator-grade cerium YAG look dimThis is a D20 I faceted from white sapphire. It weighs in at 53 carats and measures 20mm point to point. The numbering is not perfect the center of the '4' on 14 ended up filled in. I faceted this d20 from a sapphire rod which was intended to go into infrared countermeasures against heatseeking missiles (IRCM) back in the cold war so not only is it bright and durable it gets a +2 in saving throws against fire!