I have typical dragons: Huge, scaly, winged, and fire-breathing. I also have dragon magic, but I'd prefer answers not to draw on this too much. In my world, a planet similar to earth, dragons live on a separate continent from humans, so sightings are rare, and even rarer are actual pieces of dragons, e.g. a scale, tooth, or vial of breath. Obviously, since when dragons are alive, they can use these things to protect themselves, humans think it easier to take parts from dragons who are already dead through natural means. Dragons, being fairly intelligent and more civilized than most animals, bury their dead in a huge underground cavern far below the crust.
Unfortunately, I have certain scruples against humans wandering around in the great tomb, hacking off bits of the most recently deceased dragons. In fact, I don't particularly care for the sort of human who would want dragon parts, and I want to make getting scales, teeth, etc., harder than that for them. In order to force humans to attack living dragons to get the parts but also make dead dragons still, well, really cool, I thought the dragon remains could turn into diamond, diamonds, or some sort of precious stone/jewel. I'd heard of the carbon from human ashes being turned into diamonds through high pressure and high temperatures, and I wondered if having the tomb be a *hundred miles under the surface of the earth, maybe even under a volcano, would raise the temperature and pressure enough to do something of the sort to the remains.
Obviously, dragons don't have the means to separate the carbon from the other ashes, supposing there were any, so how might the dragon remains be **jewelified?
This is subject to change.
Er, heh heh!