Sapphire D20 53ct, 1980s Infrared Countermeasures Sapphire

This 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!