A Spican flame gem is a low value gemstone.
In 2268, Cyrano Jones failed in an attempt to sell flame gems, along with Antarean glow water, to a bartender on Deep Space K-7. (TOS: "The Trouble with Tribbles", DS9: "Trials and Tribble-ations")
Jones would later attempt to sell some of the same flame gems to Captain Kirk in 2269 with similar results. (TAS: "More Tribbles, More Troubles")