Dilithium crystal

From Wikihack

Dilithium crystal is the most valuable gem in NetHack with base value of 4500 zorkmids. It's white, soft, (cannot be used for engraving) and the name is a reference to Star Trek.

*	Name	Description	Cost (zm)	Weight	Hardness	Material
*	dilithium crystal	white gem	4500	1	soft	gemstone