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The adventure doesn't say, and to my eye does its best to stress it doesn't matter (it's sold and gone by the time the adventure starts). It's referred to as a relic and an artifact, but isn't necessarily either of those in the technical sense. So it's probably some high-level item (magical, hybrid, etc.) that could be found deep inside the sun. If the players get curious, I'd dig up some magic item (or maybe lesser artifact) associated with efreet, the Plane of Fire, or some such. Or you could use it to foreshadow the culture the PCs are going to encounter down the line.