These dragons were recently discovered deep within the Tull Caverns. The Wizard scholars are abuzz with the mysteries surrounding this dragon, some theorize that they are the ancient ancestors of gemstone dragons. While sharing a marked resemblance to gemstone dragons, they are unable to generate magic gems and retain the ability to breed with other dragons.
The required elements of earth and water is likely a reference to how geodes are formed in a cavity of igenous or sedimentary rock and over time groundwater solutions allow crystals to form inside the hollow chamber of the geode.