Rigelian flamegem
A Rigelian flamegem was a precious jewel from the Rigel system. They were illegal in the region of space near the Mutara sector during the 22nd century. 

In an alternate timeline, Yerdrin Lek claimed to be a dealer in flamegems that had jettisoned his cargo when captured by  in 2165. ()

See also
 Spican flame gem

ja:ライジェリアン・フレイムジェム
nl:Rigelian vlam edelsteen
Gemstones