Although diamond is formed at high temperature and high pressure, it can still change its phase state if the physical and chemical conditions change greatly enough.
The preservation of diamonds should avoid high temperature. The composition of diamond is carbon, so are diamond and graphite, but the space of their atomic arrangement structure is different, which leads to their melting point, hardness and appearance are very different. In air, diamonds need to be heated to 850- 1000 degrees Celsius (Celsius) to burn and become gas. Because diamonds are made of pure carbon atoms, they all turn into gases after burning, leaving no "ashes".
Extended data
Diamonds are afraid of heat
Although diamonds are formed at high temperature and high pressure, their main component is carbon. When heated to 800 degrees in the air, it will burn and become carbon dioxide gas. So don't let your diamond get close to high temperature, and don't be too curious. Test the diamond with a big open flame, or your little baby will probably sublimate and disappear directly ~
China Com: There are several things that diamonds fear most. You must not do this!