Dragon treasure

"Sleeping on a dragon's hoard with greedy, dragonish thoughts in his heart, he had become a dragon himself."

- C.S. Lewis, about Eustace Scrubb

Dragon Treasure describes any treasure found in a dragon's lair. It is apparently enchanted, as Eustace Scrubb was turned into a dragon when he slept on a dragon's hoard.

The substantial hoard on Dragon Island consisted of the usual coins, rings, bracelets, ingots, cups, plates and gems, as well as the lord Octesian's arm-ring.

Film Adaption
In the Voyage of the Dawn Treader film, Caspian mentions that a Dragon's Treasure is enchanted, and apparently that is common knowledge to everyone in Narnia. However, Eustace did not know that.

"Anyone knows a dragon's treasure is enchanted." (Eustace growls) "Well, anyone from here."

- Caspian