The Murustavan Ruby was a priceless, unique gem revered as an artifact on the planet Sullust. It was approximately the size of a Sullustan's fist and was valuable not only for its size, but for its age. At the time of the Cold War the gem was already millennia old.
The gem was stolen by the notorious criminal Skavak, who intended to deliver a fake version of the gem to Commander Kasstroff of the Sith, but was thwarted by the combined efforts of Miel Muwn, a peace officer with the Sullustan Constable Brigade, and Skavak's nemesis, the smuggler captain who would later come to be known as the Voidhound.