Sapphire D20 53ct, 1980s Infrared Countermeasures Sapphire T-shirts While virtually all GAGG has

While virtually all GAGG has at least a little afterglow

These are faceted hologram crystals

but there are more to come

and which color predominates depends on the lighting (color and angle) as well as the background it is set against

best visible under 365nm UV

Sapphire D20 53ct, 1980s Infrared Countermeasures Sapphire T-shirts While virtually all GAGG hasThis 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!